diff --git a/commands.go b/commands.go
index 508290e3..03ad9eff 100644
--- a/commands.go
+++ b/commands.go
@@ -6,6 +6,16 @@ import (
 
 //------------------------------------------------------------------------------
 
+type Limit struct {
+	Offset, Count int64
+}
+
+func NewLimit(offset, count int64) *Limit {
+	return &Limit{offset, count}
+}
+
+//------------------------------------------------------------------------------
+
 func (c *Client) Auth(password string) *StatusReq {
 	req := NewStatusReq("AUTH", password)
 	c.Run(req)
@@ -641,6 +651,207 @@ func (c *Client) SUnionStore(destination string, keys ...string) *IntReq {
 
 //------------------------------------------------------------------------------
 
+type ZMember struct {
+	Score  float64
+	Member string
+}
+
+func NewZMember(score float64, member string) *ZMember {
+	return &ZMember{score, member}
+}
+
+func (m *ZMember) ScoreString() string {
+	return strconv.FormatFloat(m.Score, 'f', -1, 32)
+}
+
+func (c *Client) ZAdd(key string, members ...*ZMember) *IntReq {
+	args := []string{"ZADD", key}
+	for _, m := range members {
+		args = append(args, m.ScoreString(), m.Member)
+	}
+	req := NewIntReq(args...)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZCard(key string) *IntReq {
+	req := NewIntReq("ZCARD", key)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZCount(key, min, max string) *IntReq {
+	req := NewIntReq("ZCOUNT", key, min, max)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZIncrBy(key string, increment int64, member string) *IntReq {
+	req := NewIntReq("ZINCRBY", key, strconv.FormatInt(increment, 10), member)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZInterStore(
+	destination string,
+	numkeys int64,
+	keys []string,
+	weights []int64,
+	aggregate string,
+) *IntReq {
+	args := []string{"ZINTERSTORE", destination, strconv.FormatInt(numkeys, 10)}
+	args = append(args, keys...)
+	if weights != nil {
+		args = append(args, "WEIGHTS")
+		for _, w := range weights {
+			args = append(args, strconv.FormatInt(w, 10))
+		}
+	}
+	if aggregate != "" {
+		args = append(args, "AGGREGATE", aggregate)
+	}
+	req := NewIntReq(args...)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZRange(key string, start, stop int64, withScores bool) *MultiBulkReq {
+	args := []string{
+		"ZRANGE",
+		key,
+		strconv.FormatInt(start, 10),
+		strconv.FormatInt(stop, 10),
+	}
+	if withScores {
+		args = append(args, "WITHSCORES")
+	}
+	req := NewMultiBulkReq(args...)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZRangeByScore(
+	key string,
+	min, max string,
+	withScores bool,
+	limit *Limit,
+) *MultiBulkReq {
+	args := []string{"ZRANGEBYSCORE", key, min, max}
+	if withScores {
+		args = append(args, "WITHSCORES")
+	}
+	if limit != nil {
+		args = append(
+			args,
+			"LIMIT",
+			strconv.FormatInt(limit.Offset, 10),
+			strconv.FormatInt(limit.Count, 10),
+		)
+	}
+	req := NewMultiBulkReq(args...)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZRank(key, member string) *IntNilReq {
+	req := NewIntNilReq("ZRANK", key, member)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZRem(key string, members ...string) *IntReq {
+	args := append([]string{"ZREM", key}, members...)
+	req := NewIntReq(args...)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZRemRangeByRank(key string, start, stop int64) *IntReq {
+	req := NewIntReq(
+		"ZREMRANGEBYRANK",
+		key,
+		strconv.FormatInt(start, 10),
+		strconv.FormatInt(stop, 10),
+	)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZRemRangeByScore(key, min, max string) *IntReq {
+	req := NewIntReq("ZREMRANGEBYSCORE", key, min, max)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZRevRange(key, start, stop string, withScores bool) *MultiBulkReq {
+	args := []string{"ZREVRANGE", key, start, stop}
+	if withScores {
+		args = append(args, "WITHSCORES")
+	}
+	req := NewMultiBulkReq(args...)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZRevRangeByScore(
+	key, start, stop string,
+	withScores bool,
+	limit *Limit,
+) *MultiBulkReq {
+	args := []string{"ZREVRANGEBYSCORE", key, start, stop}
+	if withScores {
+		args = append(args, "WITHSCORES")
+	}
+	if limit != nil {
+		args = append(
+			args,
+			"LIMIT",
+			strconv.FormatInt(limit.Offset, 10),
+			strconv.FormatInt(limit.Count, 10),
+		)
+	}
+	req := NewMultiBulkReq(args...)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZRevRank(key, member string) *IntNilReq {
+	req := NewIntNilReq("ZREVRANK", key, member)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZScore(key, member string) *FloatReq {
+	req := NewFloatReq("ZSCORE", key, member)
+	c.Run(req)
+	return req
+}
+
+func (c *Client) ZUnionStore(
+	destination string,
+	numkeys int64,
+	keys []string,
+	weights []int64,
+	aggregate string,
+) *IntReq {
+	args := []string{"ZUNIONSTORE", destination, strconv.FormatInt(numkeys, 10)}
+	args = append(args, keys...)
+	if weights != nil {
+		args = append(args, "WEIGHTS")
+		for _, w := range weights {
+			args = append(args, strconv.FormatInt(w, 10))
+		}
+	}
+	if aggregate != "" {
+		args = append(args, "AGGREGATE", aggregate)
+	}
+	req := NewIntReq(args...)
+	c.Run(req)
+	return req
+}
+
+//------------------------------------------------------------------------------
+
 func (c *Client) PubSubClient() *PubSubClient {
 	return NewPubSubClient(c.connect, c.disconnect)
 }
diff --git a/redis_test.go b/redis_test.go
index 1ed4af4f..5f6cc1fb 100644
--- a/redis_test.go
+++ b/redis_test.go
@@ -108,9 +108,7 @@ func (t *RedisTest) TestKeys(c *C) {
 
 	keys, err := t.redisC.Keys("*").Reply()
 	c.Check(err, IsNil)
-	c.Check(keys, HasLen, 2)
-	c.Check(keys[0], Equals, "foo1")
-	c.Check(keys[1], Equals, "foo2")
+	c.Check(keys, DeepEquals, []interface{}{"foo1", "foo2"})
 }
 
 func (t *RedisTest) TestMigrate(c *C) {
@@ -450,7 +448,6 @@ func (t *RedisTest) TestHGetAll(c *C) {
 
 	values, err := t.redisC.HGetAll("myhash").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 4)
 	c.Check(values, DeepEquals, []interface{}{"foo1", "bar1", "foo2", "bar2"})
 }
 
@@ -478,10 +475,9 @@ func (t *RedisTest) TestHKeys(c *C) {
 	t.redisC.HSet("myhash", "foo1", "bar1").Reply()
 	t.redisC.HSet("myhash", "foo2", "bar2").Reply()
 
-	values, err := t.redisC.HKeys("myhash").Reply()
+	keys, err := t.redisC.HKeys("myhash").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
-	c.Check(values, DeepEquals, []interface{}{"foo1", "foo2"})
+	c.Check(keys, DeepEquals, []interface{}{"foo1", "foo2"})
 }
 
 func (t *RedisTest) TestHLen(c *C) {
@@ -499,7 +495,6 @@ func (t *RedisTest) TestHMGet(c *C) {
 
 	values, err := t.redisC.HMGet("myhash", "foo1", "foo2", "_").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 3)
 	c.Check(values, DeepEquals, []interface{}{"bar1", "bar2", nil})
 }
 
@@ -545,10 +540,9 @@ func (t *RedisTest) TestHVals(c *C) {
 	t.redisC.HSet("myhash", "foo1", "bar1").Reply()
 	t.redisC.HSet("myhash", "foo2", "bar2").Reply()
 
-	values, err := t.redisC.HVals("myhash").Reply()
+	vals, err := t.redisC.HVals("myhash").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
-	c.Check(values, DeepEquals, []interface{}{"bar1", "bar2"})
+	c.Check(vals, DeepEquals, []interface{}{"bar1", "bar2"})
 }
 
 //------------------------------------------------------------------------------
@@ -558,7 +552,6 @@ func (t *RedisTest) TestBLPop(c *C) {
 
 	values, err := t.redisC.BLPop(0, "list1", "list2").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"list1", "a"})
 }
 
@@ -567,7 +560,6 @@ func (t *RedisTest) TestBrPop(c *C) {
 
 	values, err := t.redisC.BRPop(0, "list1", "list2").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"list1", "c"})
 }
 
@@ -606,7 +598,6 @@ func (t *RedisTest) TestLInsert(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 3)
 	c.Check(values, DeepEquals, []interface{}{"Hello", "There", "World"})
 }
 
@@ -630,7 +621,6 @@ func (t *RedisTest) TestLPop(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"two", "three"})
 }
 
@@ -640,7 +630,6 @@ func (t *RedisTest) TestLPush(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"Hello", "World"})
 }
 
@@ -661,7 +650,7 @@ func (t *RedisTest) TestLPushX(c *C) {
 
 	values, err = t.redisC.LRange("list2", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 0)
+	c.Check(values, DeepEquals, []interface{}{})
 }
 
 func (t *RedisTest) TestLRange(c *C) {
@@ -671,22 +660,19 @@ func (t *RedisTest) TestLRange(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, 0).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 1)
 	c.Check(values, DeepEquals, []interface{}{"one"})
 
 	values, err = t.redisC.LRange("list", -3, 2).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 3)
 	c.Check(values, DeepEquals, []interface{}{"one", "two", "three"})
 
 	values, err = t.redisC.LRange("list", -100, 100).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 3)
 	c.Check(values, DeepEquals, []interface{}{"one", "two", "three"})
 
 	values, err = t.redisC.LRange("list", 5, 10).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 0)
+	c.Check(values, DeepEquals, []interface{}{})
 }
 
 func (t *RedisTest) TestLRem(c *C) {
@@ -701,7 +687,6 @@ func (t *RedisTest) TestLRem(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"hello", "foo"})
 }
 
@@ -720,7 +705,6 @@ func (t *RedisTest) TestLSet(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 3)
 	c.Check(values, DeepEquals, []interface{}{"four", "five", "three"})
 }
 
@@ -735,7 +719,6 @@ func (t *RedisTest) TestLTrim(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"two", "three"})
 }
 
@@ -750,7 +733,6 @@ func (t *RedisTest) TestRPop(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"one", "two"})
 }
 
@@ -765,12 +747,10 @@ func (t *RedisTest) TestRPopLPush(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"one", "two"})
 
 	values, err = t.redisC.LRange("list2", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 1)
 	c.Check(values, DeepEquals, []interface{}{"three"})
 }
 
@@ -785,7 +765,6 @@ func (t *RedisTest) TestRPush(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"Hello", "World"})
 }
 
@@ -804,12 +783,11 @@ func (t *RedisTest) TestRPushX(c *C) {
 
 	values, err := t.redisC.LRange("list", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"Hello", "World"})
 
 	values, err = t.redisC.LRange("list2", 0, -1).Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 0)
+	c.Check(values, DeepEquals, []interface{}{})
 }
 
 //------------------------------------------------------------------------------
@@ -829,9 +807,7 @@ func (t *RedisTest) TestSAdd(c *C) {
 
 	members, err := t.redisC.SMembers("set").Reply()
 	c.Check(err, IsNil)
-	c.Check(members, HasLen, 2)
-	c.Check(members[0], Equals, "World")
-	c.Check(members[1], Equals, "Hello")
+	c.Check(members, DeepEquals, []interface{}{"World", "Hello"})
 }
 
 func (t *RedisTest) TestSCard(c *C) {
@@ -859,7 +835,6 @@ func (t *RedisTest) TestSDiff(c *C) {
 
 	values, err := t.redisC.SDiff("set1", "set2").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"a", "b"})
 }
 
@@ -878,7 +853,6 @@ func (t *RedisTest) TestSDiffStore(c *C) {
 
 	values, err := t.redisC.SMembers("set").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"a", "b"})
 }
 
@@ -893,7 +867,6 @@ func (t *RedisTest) TestSInter(c *C) {
 
 	values, err := t.redisC.SInter("set1", "set2").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 1)
 	c.Check(values, DeepEquals, []interface{}{"c"})
 }
 
@@ -912,7 +885,6 @@ func (t *RedisTest) TestSInterStore(c *C) {
 
 	values, err := t.redisC.SMembers("set").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 1)
 	c.Check(values, DeepEquals, []interface{}{"c"})
 }
 
@@ -934,7 +906,6 @@ func (t *RedisTest) TestSMembers(c *C) {
 
 	values, err := t.redisC.SMembers("set").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"World", "Hello"})
 }
 
@@ -950,12 +921,10 @@ func (t *RedisTest) TestSMove(c *C) {
 
 	values, err := t.redisC.SMembers("set1").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 1)
 	c.Check(values, DeepEquals, []interface{}{"one"})
 
 	values, err = t.redisC.SMembers("set2").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"three", "two"})
 }
 
@@ -1002,7 +971,6 @@ func (t *RedisTest) TestSRem(c *C) {
 
 	values, err := t.redisC.SMembers("set").Reply()
 	c.Check(err, IsNil)
-	c.Check(values, HasLen, 2)
 	c.Check(values, DeepEquals, []interface{}{"three", "two"})
 }
 
@@ -1040,6 +1008,263 @@ func (t *RedisTest) TestSUnionStore(c *C) {
 
 //------------------------------------------------------------------------------
 
+func (t *RedisTest) TestZAdd(c *C) {
+	n, err := t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(1))
+
+	n, err = t.redisC.ZAdd("zset", redis.NewZMember(1, "uno")).Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(1))
+
+	n, err = t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(1))
+
+	n, err = t.redisC.ZAdd("zset", redis.NewZMember(3, "two")).Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(0))
+
+	values, err := t.redisC.ZRange("zset", 0, -1, true).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"one", "1", "uno", "1", "two", "3"})
+}
+
+func (t *RedisTest) TestZCard(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+
+	n, err := t.redisC.ZCard("zset").Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(2))
+}
+
+func (t *RedisTest) TestZCount(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	n, err := t.redisC.ZCount("zset", "-inf", "+inf").Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(3))
+
+	n, err = t.redisC.ZCount("zset", "(1", "3").Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(2))
+}
+
+func (t *RedisTest) TestZIncrBy(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZIncrBy("zset", 2, "one").Reply()
+
+	values, err := t.redisC.ZRange("zset", 0, -1, true).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"two", "2", "one", "3"})
+}
+
+func (t *RedisTest) TestZInterStore(c *C) {
+	t.redisC.ZAdd("zset1", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset1", redis.NewZMember(2, "two")).Reply()
+
+	t.redisC.ZAdd("zset2", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset2", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset3", redis.NewZMember(3, "two")).Reply()
+
+	n, err := t.redisC.ZInterStore(
+		"out",
+		2,
+		[]string{"zset1", "zset2"},
+		[]int64{2, 3},
+		"",
+	).Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(2))
+
+	values, err := t.redisC.ZRange("out", 0, -1, true).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"one", "5", "two", "10"})
+}
+
+func (t *RedisTest) TestZRange(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	values, err := t.redisC.ZRange("zset", 0, -1, false).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"one", "two", "three"})
+
+	values, err = t.redisC.ZRange("zset", 2, 3, false).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"three"})
+
+	values, err = t.redisC.ZRange("zset", -2, -1, false).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"two", "three"})
+}
+
+func (t *RedisTest) TestZRangeByScore(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	values, err := t.redisC.ZRangeByScore("zset", "-inf", "+inf", false, nil).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"one", "two", "three"})
+
+	values, err = t.redisC.ZRangeByScore("zset", "1", "2", false, nil).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"one", "two"})
+
+	values, err = t.redisC.ZRangeByScore("zset", "(1", "2", false, nil).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"two"})
+
+	values, err = t.redisC.ZRangeByScore("zset", "(1", "(2", false, nil).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{})
+}
+
+func (t *RedisTest) TestZRank(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	n, err := t.redisC.ZRank("zset", "three").Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(2))
+
+	n, err = t.redisC.ZRank("zset", "four").Reply()
+	c.Check(err, Equals, redis.Nil)
+	c.Check(n, Equals, int64(0))
+}
+
+func (t *RedisTest) TestZRem(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	n, err := t.redisC.ZRem("zset", "two").Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(1))
+
+	values, err := t.redisC.ZRange("zset", 0, -1, true).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"one", "1", "three", "3"})
+}
+
+func (t *RedisTest) TestZRemRangeByRank(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	n, err := t.redisC.ZRemRangeByRank("zset", 0, 1).Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(2))
+
+	values, err := t.redisC.ZRange("zset", 0, -1, true).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"three", "3"})
+}
+
+func (t *RedisTest) TestZRemRangeByScore(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	n, err := t.redisC.ZRemRangeByScore("zset", "-inf", "(2").Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(1))
+
+	values, err := t.redisC.ZRange("zset", 0, -1, true).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"two", "2", "three", "3"})
+}
+
+func (t *RedisTest) TestZRevRange(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	values, err := t.redisC.ZRevRange("zset", "0", "-1", false).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"three", "two", "one"})
+
+	values, err = t.redisC.ZRevRange("zset", "2", "3", false).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"one"})
+
+	values, err = t.redisC.ZRevRange("zset", "-2", "-1", false).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"two", "one"})
+}
+
+func (t *RedisTest) TestZRevRangeByScore(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	values, err := t.redisC.ZRevRangeByScore("zset", "+inf", "-inf", false, nil).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"three", "two", "one"})
+
+	values, err = t.redisC.ZRevRangeByScore("zset", "2", "(1", false, nil).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"two"})
+
+	values, err = t.redisC.ZRevRangeByScore("zset", "(2", "(1", false, nil).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{})
+}
+
+func (t *RedisTest) TestZRevRank(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset", redis.NewZMember(3, "three")).Reply()
+
+	n, err := t.redisC.ZRevRank("zset", "one").Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(2))
+
+	n, err = t.redisC.ZRevRank("zset", "four").Reply()
+	c.Check(err, Equals, redis.Nil)
+	c.Check(n, Equals, int64(0))
+}
+
+func (t *RedisTest) TestZScore(c *C) {
+	t.redisC.ZAdd("zset", redis.NewZMember(1.001, "one")).Reply()
+
+	score, err := t.redisC.ZScore("zset", "one").Reply()
+	c.Check(err, IsNil)
+	c.Check(score, Equals, float64(1.001))
+}
+
+func (t *RedisTest) TestZUnionStore(c *C) {
+	t.redisC.ZAdd("zset1", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset1", redis.NewZMember(2, "two")).Reply()
+
+	t.redisC.ZAdd("zset2", redis.NewZMember(1, "one")).Reply()
+	t.redisC.ZAdd("zset2", redis.NewZMember(2, "two")).Reply()
+	t.redisC.ZAdd("zset2", redis.NewZMember(3, "three")).Reply()
+
+	n, err := t.redisC.ZUnionStore(
+		"out",
+		2,
+		[]string{"zset1", "zset2"},
+		[]int64{2, 3},
+		"",
+	).Reply()
+	c.Check(err, IsNil)
+	c.Check(n, Equals, int64(3))
+
+	values, err := t.redisC.ZRange("out", 0, -1, true).Reply()
+	c.Check(err, IsNil)
+	c.Check(values, DeepEquals, []interface{}{"one", "5", "three", "9", "two", "10"})
+}
+
+//------------------------------------------------------------------------------
+
 func (t *RedisTest) TestPubSub(c *C) {
 	pubsub := t.redisC.PubSubClient()
 
diff --git a/request.go b/request.go
index c9af41ea..d76858ca 100644
--- a/request.go
+++ b/request.go
@@ -13,6 +13,16 @@ var Nil = errors.New("(nil)")
 
 //------------------------------------------------------------------------------
 
+func isNil(buf []byte) bool {
+	return len(buf) == 3 && buf[0] == '$' && buf[1] == '-' && buf[2] == '1'
+}
+
+func isEmpty(buf []byte) bool {
+	return len(buf) == 2 && buf[0] == '$' && buf[1] == '0'
+}
+
+//------------------------------------------------------------------------------
+
 func ParseReq(rd *bufreader.Reader) ([]string, error) {
 	line, err := rd.ReadLine('\n')
 	if err != nil {
@@ -173,6 +183,42 @@ func (r *IntReq) Reply() (int64, error) {
 
 //------------------------------------------------------------------------------
 
+type IntNilReq struct {
+	*BaseReq
+}
+
+func NewIntNilReq(args ...string) *IntNilReq {
+	return &IntNilReq{
+		BaseReq: NewBaseReq(args...),
+	}
+}
+
+func (r *IntNilReq) ParseReply(rd *bufreader.Reader) (interface{}, error) {
+	line, err := rd.ReadLine('\n')
+	if err != nil {
+		return nil, err
+	}
+
+	if line[0] == '-' {
+		return nil, errors.New(string(line[1:]))
+	} else if line[0] == ':' {
+		return strconv.ParseInt(string(line[1:]), 10, 64)
+	} else if isNil(line) {
+		return nil, Nil
+	}
+
+	return nil, fmt.Errorf("Expected ':', but got %q of %q.", line, rd.Bytes())
+}
+
+func (r *IntNilReq) Reply() (int64, error) {
+	if r.err != nil {
+		return 0, r.err
+	}
+	return r.val.(int64), nil
+}
+
+//------------------------------------------------------------------------------
+
 type BoolReq struct {
 	*BaseReq
 }
@@ -229,7 +275,7 @@ func (r *BulkReq) ParseReply(rd *bufreader.Reader) (interface{}, error) {
 		return nil, fmt.Errorf("Expected '$', but got %q of %q.", line, rd.Bytes())
 	}
 
-	if len(line) >= 3 && line[1] == '-' && line[2] == '1' {
+	if isNil(line) {
 		return nil, Nil
 	}
 
@@ -250,6 +296,49 @@ func (r *BulkReq) Reply() (string, error) {
 
 //------------------------------------------------------------------------------
 
+type FloatReq struct {
+	*BaseReq
+}
+
+func NewFloatReq(args ...string) *FloatReq {
+	return &FloatReq{
+		BaseReq: NewBaseReq(args...),
+	}
+}
+
+func (r *FloatReq) ParseReply(rd *bufreader.Reader) (interface{}, error) {
+	line, err := rd.ReadLine('\n')
+	if err != nil {
+		return nil, err
+	}
+
+	if line[0] == '-' {
+		return nil, errors.New(string(line[1:]))
+	} else if line[0] != '$' {
+		return nil, fmt.Errorf("Expected '$', but got %q of %q.", line, rd.Bytes())
+	}
+
+	if isNil(line) {
+		return nil, Nil
+	}
+
+	line, err = rd.ReadLine('\n')
+	if err != nil {
+		return nil, err
+	}
+
+	return strconv.ParseFloat(string(line), 64)
+}
+
+func (r *FloatReq) Reply() (float64, error) {
+	if r.err != nil {
+		return 0, r.err
+	}
+	return r.val.(float64), nil
+}
+
+//------------------------------------------------------------------------------
+
 type MultiBulkReq struct {
 	*BaseReq
 }
@@ -276,7 +365,7 @@ func (r *MultiBulkReq) ParseReply(rd *bufreader.Reader) (interface{}, error) {
 
 	if len(line) >= 2 && line[1] == '0' {
 		return val, nil
-	} else if len(line) >= 3 && line[1] == '-' && line[2] == '1' {
+	} else if isNil(line) {
 		return nil, Nil
 	}
 
@@ -293,9 +382,9 @@ func (r *MultiBulkReq) ParseReply(rd *bufreader.Reader) (interface{}, error) {
 			}
 			val = append(val, n)
 		} else if line[0] == '$' {
-			if len(line) >= 2 && line[1] == '0' {
+			if isEmpty(line) {
 				val = append(val, "")
-			} else if len(line) >= 3 && line[1] == '-' && line[2] == '1' {
+			} else if isNil(line) {
 				val = append(val, nil)
 			} else {
 				line, err = rd.ReadLine('\n')