Also would like to add that there are a ton of downloadable games for both systems. I hear braid alot and geometry wars and castle crashers for xbox 360. For ps3 there are quite a few that I own that made me not even look to get an additional console and they are.
1) Fat princess (32 player online multiplayer and trophies out this summer)
2) Everyday shooter (fantastic game with an amazing audio soundtrack)
3) Pixel junk monsters (tower defense game with charming 2d graphics and trophies)
4) Astro Tripper (very nice HD graphics, old school shooter, and trophies)
5) Savage Moon (amazing HD graphics, rts/tower defense game w/ trophies)
6) Flower (outstanding HD graphics, very relaxing w/trophies)
7) Siren (superb survival horror game)
8) WarHawk (32 muliplayer tps game with vehicles (land and air) w/trophies)
9) pixel junk eden (psychodelic HD graphics and great game play w/trophies)
10)Wipeout HD (blistering 60 fps HD extravaganza w/trophies)
11)Grand turismo prologue (blistering 60 fps HD racing at it's best)
These are all exclusive games that you cannot get anywhere else ( 100 downloadable games are now available on psn), they are all presented in full HD (1080p) and most support 7.1 lpcm no loss audio for the audio phile. These alone are games that cost any where from 4.99$ to 29.99 on the psn (playstation network) and should not be missed, and this is because they are the gems of this generation of consoles (IMOB).