I've only just heard that to apologize for the Playstation Network's recent period of deadness, they're offering a choice of two downloadable titles from a list of five (and more, if you have a PSP).

Are any of these any good, then? (We've got Little Big Planet, but now I come to think of it, we haven't played it in a very long time.)

From that page, it also looks like this only applies to North America - Sony might expect European users to just go back to banging rocks together and pointing at the magic box that lights up.