Don't forget:
GRID - June 3rd
GT meats Dirt.
DragonBall Z: Burst Limit - June 10th
Another DBZ fighter. Looks gorgeous though.
Soulcalibur IV - July 29th
I'm looking forward to Soulcalibur although I think the whole Yoda/Darth Vader thing is kinda lame, and I'll probably give Bust Limit a rent because I quite enjoyed the demo.
IGN PS3 Release Dates List