I know you guys have seen me around the forum, as I'm a huge Bioshock fan. Well starting soon in the Interactive Role Playing forum, I'll be hosting a Bioshock themed Mafia Game. Mafia games are not standard role playing, as you don't actually act like your character.
The general idea is that there are townsfolk and the mafia. Both groups try and get rid of the other one. They're a lot of fun, and if you're interested, you can get more information in the IRP forum.