This would be massive but Natal isn't being released until Fall 2010. The only thing I see being a system seller is Halo: Reach/Natal. SC:C might move a few units but nothing great or consistant, same goes for ME2 and Alan Wake. Crackdown, fable and gears probably won't really move anything unless Natal is major success and these games incorporate it for the hardcore gamers and we all know that's not going to happen. I can't see Madden Natal or Fifa Natal selling well at all if it happened but I guess it depends on the quality of it. Guitar Hero...are you serious? Kay honestly how would you incorporate GH into Natal? Just pretend to hold a guitar? You'd look like an idiot lol.