Microsoft recently unveiled their secret project "NATAL" for the XBox360 at E3. It's a 100% motion-based setup where the person is the controller and no special accessories required. It's basically Microsoft's response to the Wii's motion-based gaming, but from the demonstration video that Microsoft showed to the E3 crowds, it takes gaming to a whole new level. You can check out the demo video of NATAL here: http://www.youtube.com/watch?v=OfB4JjhcifM
If Microsoft releases NATAL, it works just as well as the demo video, and has great games to go with it, I think I may have to get a XBox360.