Road Rash II was an AWESOME game for Sega Genesis. Probably my favorite. I'd love to see that game on a next/current-gen system. Especially the Wii, using the motion controls. You swing the Wiimote to either side to bash an opponent and knock them off their bike using a weapon of some sort.
Man that game was sweet. If you don't know about it, it's a motorcycle race game where you can use sticks, chains, bats, etc to knock your opponents off their bikes. Online multiplayer would be sweet too. Imagine Mario Kart if it used motorcycles and was rated T or even M.
Edit: heres the wiki