I think this thing looks ugly as sin, and I'm not sure how spot-on a Bluetooth connection would be for gaming, but the iCade is an interesting product nonetheless:
http://www.anandtech.com/show/5337/...eup-with-icade-core-icade-mobile-and-icade-jr
http://www.anandtech.com/show/5337/...eup-with-icade-core-icade-mobile-and-icade-jr