fix NameError: global name 'TimestampedNotificationData' is not define

darcs-hash:20090421084419-b2873-8d126cf5690c64651c365452579c85057fc3e33c
Update to do

darcs-hash:20090421085551-58252-3f63b8809c718d83559c9016b5ea9188b1376966