Wow, so the OP showed some bias or naivety or something. Here's the real list so we can get a real comparison going, and I also marked PC shared games as such because they're valid to a console vs console thread. I'm abiding by his rule that games have to be officially announced for '09 and questionable games will be marked as such as well. Also note that some of these games are unknowns pulled from Wiki and I'll tell you if they're smaller releases or iffy by marking them with a *.
Xbox 360 Exclusives for 2009:
- Age of Conan (360/PC, MMORPG) from Funcom
- Alan Wake (360/PC, Horror) from Remedy Entertainment
- APB: All Points Bulletin (PC/360, MMO) from Real Time Worlds
- Champions Online (360/PC, MMORPG) from Cyptic Studios
- Divinity 2 - Ego Draconis (PC/360, RPG) from Larian Studios* [Don't know what this is really.]
- Forza Motorsport 3 (360, Racing) from Turn 10 Studios* [Kind of confirmed. Check Wiki for details.]
- Halo 3: Recon (360, FPS) from Bungie [This is standalone]
- Halo Wars (360, RTS) from Ensemble Studios R.I.P.
- Mass Effect 2 (360/PC, WRPG) from Bioware
- RacePro (360, Racing) from SimBin* [Don't know what this is really.]
- Raven Squad: Operation Hidden Dagger (PC/360, RTS/FPS)* from Atomic Motion [Yeah, it's another unknown for me.]
- Star Ocean: The Last Hope (360, ARPG) from Tri-Ace
- Splinter Cell: Conviction (360/PC, Stealth) from Ubisoft Montreal
- Velvet Assasin (360/PC, Stealth) from Replay Studios
- Venetica (360/PC, RPG) from Deck13* [Another unknown title.]
PlayStation 3 Exclusives for 2009:
- The Agency (PS3/PC, MMO) from SOE Seattle
- Amphibian Man (PS3/PC, ?) from KD Vision Games* [I think this is vapor or multiplat but it was on Wiki as PS3/PC.]
- DC Universe Online (PS3/PC, MMORPG) from Sony Online Austin
- Demon's Souls (PS3, Action) from From Software
- EyePet (PS3, Pet Sim) from SCE London
- Free Realms (PS3/PC, MMORPG) from Sony Online Entertainment* [First time I've heard of this game. Not a slight BTW.]
- God of War III (PS3, Adventure) from SCE Studios Santa Monica* [Doubt it's a 2009 release, but it's marked as such.]
- Gran Turismo 5 (PS3, Racing) from Polyphony Digital
- Heavy Rain (PS3, Mystery/Thriller) from Quantic Dream
- inFamous (PS3, Sandbox) from Sucker Punch Productions
- Killzone 2 (PS3, FPS) from Guerilla Games
- L.A. Noire (PS3/?, Detective/Sandbox) from Team Bondi* [This is likely to be multiplat, but it's still listed as PS3 only.]
- MAG: Massive Action Game (PS3, MMO Shooter) from Zipper Interactive
- Nobi Nobi Boy (PS3, Action) from Namco Bandai* [It's from Katamari creator, but I dunno about '09 release.]
- Quantum Theory (PS3, 3rd Person Shooter) from Tecmo
- Uncharted 2 (PS3, Action-Adventure) from Naughty Dog* [They are working on a 2009 release, but it's not certain.]
- WarDevil: Unleash the Beast Within (PS3, Action-Adventure) from Digi-Guys* [Never heard of this until today.]
- Yakuza 3 (PS3, Action-Adventure) from Amusent Vision
I'm sure I missed a few games and you can tell me so, but do not try to claim I'm a fanboy or something because this list was taken directly from Wikipedia.