diff --git a/AUTHORS b/AUTHORS
index 119bb8b20a..92b1559042 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -26,6 +26,7 @@ And here is an inevitably incomplete list of MUCH-APPRECIATED CONTRIBUTORS --
 people who have submitted patches, reported bugs, added translations, helped
 answer newbie questions, and generally made Django that much better:
 
+    Gisle Aas <gisle@aas.no>
     ajs <adi@sieker.info>
     alang@bright-green.com
     Alcides Fonseca
diff --git a/django/utils/datastructures.py b/django/utils/datastructures.py
index d6fc9dc56f..3cbbe27b91 100644
--- a/django/utils/datastructures.py
+++ b/django/utils/datastructures.py
@@ -37,11 +37,32 @@ class MergeDict(object):
                 return dict_.getlist(key)
         return []
 
-    def items(self):
-        item_list = []
+    def iteritems(self):
+        seen = set()
         for dict_ in self.dicts:
-            item_list.extend(dict_.items())
-        return item_list
+            for item in dict_.iteritems():
+                k, v = item
+                if k in seen:
+                    continue
+                seen.add(k)
+                yield item
+
+    def iterkeys(self):
+        for k, v in self.iteritems():
+            yield k
+
+    def itervalues(self):
+        for k, v in self.iteritems():
+            yield v
+
+    def items(self):
+        return list(self.iteritems())
+
+    def keys(self):
+        return list(self.iterkeys())
+
+    def values(self):
+        return list(self.itervalues())
 
     def has_key(self, key):
         for dict_ in self.dicts:
@@ -50,6 +71,7 @@ class MergeDict(object):
         return False
 
     __contains__ = has_key
+    __iter__ = iterkeys
 
     def copy(self):
         """Returns a copy of this object."""
diff --git a/tests/regressiontests/datastructures/tests.py b/tests/regressiontests/datastructures/tests.py
index b7885e65a4..a858e2469f 100644
--- a/tests/regressiontests/datastructures/tests.py
+++ b/tests/regressiontests/datastructures/tests.py
@@ -34,6 +34,17 @@ MergeDict can merge MultiValueDicts
 >>> mm.getlist('undefined')
 []
 
+>>> sorted(mm.keys())
+['key1', 'key2', 'key4']
+>>> len(mm.values())
+3
+>>> "value1" in mm.values()
+True
+>>> sorted(mm.items(), key=lambda k: k[0])
+[('key1', 'value1'), ('key2', 'value3'), ('key4', 'value6')]
+>>> [(k,mm.getlist(k)) for k in sorted(mm)]
+[('key1', ['value1']), ('key2', ['value2', 'value3']), ('key4', ['value5', 'value6'])]
+
 ### MultiValueDict ##########################################################
 
 >>> d = MultiValueDict({'name': ['Adrian', 'Simon'], 'position': ['Developer']})