Modder "demize2010" has created a Kinect hack that allows players to control Street Fighter IV using gesture controls. Using a Kinect and the FAAST SDK software, demize2010 managed to map Ryu and Ken's moves to specific gestures. When the user punches, throws a fireball, or kicks, the character does the moves on screen.
You can find out more about it at Kinect Hacks. Check out the video to the left to see it in action.