So many good games.. here we go.
Uncharted 1 & 2, Killzone 2, InFamous, God of War collection and GoW3, Heavy Rain, MAG, Resistance 1 & 2, MGS4, ModNation Racers, Little Big Planet.
Yeah I know it's obvious those are all exclusive but you having a 360 I'm assuming you've played a lot of multiplatform titles that are already available on the PS3 as well.