cogadh: ...free month of PSN+ which includes... wait for it... more free games!
I'm pretty sure anything free you get from PSN+ isn't owned once your PSN+ runs out. Anything payed for you keep (even at a discount), but, as far as I'm aware, free stuff goes away with Plus (provided you don't keep paying for it, that is).
But, yeah, LBP and inFAMOUS would be awesome. I wonder what the possible PSP games are, though.
EDIT: Eh. The PSP games are pretty meh.
LittleBigPlanet (PSP)
ModNation Racers
Pursuit Force
Killzone Liberation
I have no real interest in any of these with the exception of, maybe, LBP PSP, but I could just get the PS3 version, so...