A very cool dungeon key generator for AD&D has been posted over at Djeryv's Graveyard. It allows you to select monsters by level from the Monster Manuals and Fiend Folio, and the generator will create up to 100 rooms, complete with treasure and traps, as well as a random encounter table! There's a generator for outdoor encounters, a dungeon map generator that uses geomorphs, and other goodies as well. Check out Djeryv's Graveyard for the AD&D/OSRIC link in the side bar that will take you to the dungeon generator page. This could be really useful for a last-minute megadungeon gaming session, or simply to get some ideas while working on dungeon levels.
I showed it to my wife who is currently refereeing our home campaign, and she was practically drooling over it.