You may or may not be able to play PS3 games on your PSP. One user, K0NYsan, found that he could play a Japanese downloadable title on his PSP through the Remote Play feature on the PS3.
Just think of the possibilities if this ends up working for all downloadable titles. Imagine playing Warhawk from miles away over Remote Play with your PSP. I’m going to go wipe up my drool now.
if you could play any ps3 game from anywhere in your house on the psp that would be so tite!!!!!! you would be like at the best part in the level and be like “i gotta take a dump” so you grab the psp and run to the bathroom. Or if ur tired and u just wanna chill in ur bed, this might be easier.