Retail
Uncharted: Drake's Fortune
GT5: Prologue (Assuming that you like the GT series and can't wait for the full GT5)
Ratchet & Clank Future: Tools of Destruction
Disgaea 3 & Valkyria Chronicles (If you like SRPGs)
Heavenly Sword
Resistance: Fall of Man
Motorstorm
MLB: The Show
PSN
Super Stardust HD
Wipeout HD
Pixeljunk Monsters/Eden
R&C: Quest for Booty
Siren