Snake's right on the money as usual, annt--Gravano is too hot to kill. And, you're right: you did see him on TV a couple of years ago. Shows you the brainpower we're dealing with here. I bet that part of his plea in the ecstasy case is that he gets some kind of protective custody.
As for Hoffa: The Detroit News had a good story about him and his disappearance last year. Here's the link:
http://www.detroitnews.com/2001/metro/0109/07/metro-287583.htm