Index: django/contrib/admin/sites.py
===================================================================
--- django/contrib/admin/sites.py	(revision 7933)
+++ django/contrib/admin/sites.py	(working copy)
@@ -249,9 +249,6 @@
         else:
             if user.is_active and user.is_staff:
                 login(request, user)
-                # TODO: set last_login with an event.
-                user.last_login = datetime.datetime.now()
-                user.save()
                 if request.POST.has_key('post_data'):
                     post_data = _decode_post_data(request.POST['post_data'])
                     if post_data and not post_data.has_key(LOGIN_FORM_KEY):