diff --git a/generic_utils.py b/generic_utils.py
index eeb26d6..0bf289e 100644
--- a/generic_utils.py
+++ b/generic_utils.py
@@ -31,6 +31,7 @@
 Intended to be imported into another namespace
 """
 
+import collections
 import functools
 import sys
 import of_g
@@ -99,8 +100,6 @@
 #
 ################################################################
 
-import collections
-
 class OrderedSet(collections.MutableSet):
     """
     A set implementations that retains insertion order.  From the receipe
@@ -164,6 +163,59 @@
             return len(self) == len(other) and list(self) == list(other)
         return set(self) == set(other)
 
+################################################################
+#
+# OrderedDefaultDict
+#
+################################################################
+
+class OrderedDefaultDict(collections.OrderedDict):
+    """
+    A Dictionary that maintains insertion order where missing values
+    are provided by a factory function, i.e., a combination of
+    the semantics of collections.defaultdict and collections.OrderedDict.
+    """
+    def __init__(self, default_factory=None, *a, **kw):
+        if (default_factory is not None and
+                not callable(default_factory)):
+            raise TypeError('first argument must be callable')
+        collections.OrderedDict.__init__(self, *a, **kw)
+        self.default_factory = default_factory
+
+    def __getitem__(self, key):
+        try:
+            return collections.OrderedDict.__getitem__(self, key)
+        except KeyError:
+            return self.__missing__(key)
+
+    def __missing__(self, key):
+        if self.default_factory is None:
+            raise KeyError(key)
+        self[key] = value = self.default_factory()
+        return value
+
+    def __reduce__(self):
+        if self.default_factory is None:
+            args = tuple()
+        else:
+            args = self.default_factory,
+        return type(self), args, None, None, self.items()
+
+    def copy(self):
+        return self.__copy__()
+
+    def __copy__(self):
+        return type(self)(self.default_factory, self)
+
+    def __deepcopy__(self, memo):
+        import copy
+        return type(self)(self.default_factory,
+                          copy.deepcopy(self.items()))
+    def __repr__(self):
+        return 'OrderedDefaultDict(%s, %s)' % (self.default_factory,
+                                        collections.OrderedDict.__repr__(self))
+
+
 def find(iterable, func):
     """
     find the first item in iterable for which func returns something true'ish.