The skeleton key that you use to unlock the door in the sewers, on the way to the shadowfist temple does not work. It says that the feature is not currently implemented in the game, or some message along those lines.
This has been posted already...
All key bugs should go here theres a list for them since they are all related bugs...
http://www.greatermud.com/forums/index.php?topic=1298.0 (http://www.greatermud.com/forums/index.php?topic=1298.0)