yeah, the free games in question are for keepsies. Also the article I orignially read this on specifically said that anything downloaded with the playstation plus discount (which presumably includes the 100% discount on some ps1 games) can be kept at no further price after your 30 days is up.
OT: I already own LBP, but the other 4 options are making me stop and think. I don't really do racers, but i have fond memories of wipeout from when I was young. Dead Nation and Stardust look like highly polished versions of anything you can find on Newgrounds, but they look to be very polished indeed. I've never actually played an R&C game, which I have been meaning to, but I'm not 100% on whether Australia gets that or Stardust. And I'm told Infamous is too similar to Prototype to bother getting both, and I already own Prototype. I'm just disappointed Modnation Racers isn't available for the PS3.