steve o 3000

2 games? You forgot about:
Alan Wake
Banjo-Kazooie
Blue Dragon
Crackdown
Fable 2
Forza Motorsport 2
Fuzion Frenzy 2
Gears of War
Halo 3
Halo Wars
Infinite Undiscovery
Kameo: Elements of Power
Kingdom Under Fire: Circle of Doom
Lost Odyssey
Marvel Universe Online
Mass Effect
Project Gotham Racing 4
Shadowrun
Too Human
Viva Piñata
BioShock
Cry On
Bullet Witch
Battlestations: Midway
Crossfire
Kane and Lynch: Dead Men
FIFA 2007 (for next generation consoles)
Culdcept Saga
Eternal Sonata (Trusty Bell)
Idol Master
Mobile Ops: The One Year War
Zegapain XOR
Zoids Infinity EX Neo
Project Sylpheed

I'd imagine a few of Sony's few remaining exclusives like MGS4 and FFXIII will end up on 360 also so the devs can make their money since creating these games costs waaay more than before.