I guess if you think hard about it, there are a few games...
Let see Rock Band, Dead Rising, Saint Row, Crackdown, Forza.and a handful of XBLA games.
Lost Odyssey, Too Human and Ninja Gaiden are future releases that are promising. Outside of that, not much. The Halos, Gears, Mass Effects, Bioshocks, Fables will end up on the PC eventually. They even have Guitar Hero on the PC now.









