Opie and Anthony had Crazy Cabbie on their show yesterday, who has a long history with Howard Stern, and he claimed to have a Howard Stern sex tape in his possession. He wouldn't comment on whether it was with a famous woman of if another guy was involved, but he promised to bring stills of the tape to Opie and Anthony soon as proof. He also claims he is speaking to lawyers now about selling it. Here is video of him on the show discussing it...
http://www.foundrymusic.com/video.cfm?id=15239
Cabbie can be full of shit, but maybe it's time to buy up the Howard Stern domains...