This is my list of games for 360 in the next 12 months (any multi-platform are on my 360 simply because I prefer the 360's controller and Xbox Live)
Alan Wake
Army of Two
Assassin's Creed
BioShock
Blue Dragon
Call of Duty 4
Condemned 2: Bloodshot
Devil May Cry 4
Eternal Sonata (Maybe, will wait for reviews)
Fable 2
Golden Axe (maybe, depends if its good, most likely not

)
Grand Theft Auto IV
Halo 3
Halo Wars
Haze
Kane & Lynch: Dead Men
Lost Odyssy
Mass Effect
Splinter Cell: Conviction
Tom Clancys: End War
Too Human
Turok (another maybe)
My PS3 list:
Final Fantasy XIII (X-2 and XII disappointed me so strike 3 and its the final nail in FF's coffin

)
God of War 3 (even though its miles off, 2009 at the earliest)
Heavenly Sword
Killzone 2 (looks good so far, just hope it isnt bad like Killzone 1)
MGS4 (not been a fan of the series since the first, I've tried to get into it but just cant :/ will give it another go before MGS4 is out)
This list is out of date too because it was made months ago and the TGS is just around the corner. This list is the reason why I agree that the PS3 lacks games even though I purchased one a few weeks ago.