I rounded up Infamous and Dead Nation to download today. For PSP, I went with LBP and ModNation since I had no interest in the others. I'm currently downloading Infamous (estimated 500 hours lmao) and my brother has two PSN accounts so between the two of us, we'll have pretty much all the free games. I haven't activated my Plus yet. Gonna do that toward the end of the month, probably.
I wound up getting Wipeout HD and Dead Nation. I figured that they cost the most out of the three games, and Dead Nation apparently has pretty fun co-op. I'll pick up Stardust on my own, since it's just $10. Haven't decided on my PSP games yet...I have a real aversion to downloading games that are offered as physical retail copies.
I decided on Dead Nation and Wipeout HD. Really fun games and I am very Happy with getting Burnout Paradise for free. That is a fun game as well.