Retail Exclusives
Ratchet and Clank Future: Tools of Destruction
Uncharted: Drake's Fortune
Folklore
Resistance: Fall of Man
Warhawk
Heavenly Sword
Disgaea 3 (assuming you like SRPG's/the series)
PSN Exclusives
Super Stardust HD
Wipeout HD
Pixeljunk Monsters/Eden
R&C: Quest for Booty
Siren
Upcoming Exclusives
LittleBigPlanet!!!!
Resistance 2
Motorstorm: Pacific Rift
Valkyria Chronicles