Index: middleware.py
===================================================================
--- middleware.py	(revision 6626)
+++ middleware.py	(working copy)
@@ -8,14 +8,14 @@
             return response # No need to check for a redirect for non-404 responses.
         path = request.get_full_path()
         try:
-            r = Redirect.objects.get(site__id__exact=settings.SITE_ID, old_path=path)
+            r = Redirect.objects.get(site__id__exact=settings.SITE_ID, old_path__iexact=path)
         except Redirect.DoesNotExist:
             r = None
         if r is None and settings.APPEND_SLASH:
             # Try removing the trailing slash.
             try:
                 r = Redirect.objects.get(site__id__exact=settings.SITE_ID,
-                    old_path=path[:path.rfind('/')]+path[path.rfind('/')+1:])
+                    old_path__iexact=path[:path.rfind('/')]+path[path.rfind('/')+1:])
             except Redirect.DoesNotExist:
                 pass
         if r is not None: