PS3:
Battlefield Bad Company - beaten (on 360, only bought the PS3 version for the multiplayer)
God of War Collection - shelved (GoW half beaten, GoW 2 untouched)
Gran Turismo 5 Prologue - shelved (almost beaten, last few races are too hard)
Haze - shelved ("stuck" on mission 2)
Heavenly Sword - shelved
InFamous - beaten
Killzone 2 - beaten
LittleBigPlanet - beaten
Metal Gear Solid 4 - beaten
Motorstorm Pacific Rift - shelved (almost untouched)
Ratchet & Clank Tools of Destruction - beaten
Ratchet & Clank Quest For Booty - untouched
Ratchet & Clank A Crack in Time - shelved
Resistance - beaten
Resistance 2 - beaten
Uncharted - beaten
Uncharted 2 - beaten
Valkyria Chronicles - beaten
Yakuza 3 - shelved
too lazy to list games from other platforms....