MotorStorm and Resistance: Fall of Man.
MotorStorm is hard, but very entertaining. It's a challenge you just want to keep on playing.
Resistance is nothing special. Just a generic shooter. Did the story mode in co-op for a little while, but quickly went online. Everything there was extremely smooth and a blast to play.
And the PS3 just oozes class. It's a big and beautiful. Much prettier than the 360 or Wii, that's for sure.