The newly revealed Sideway is exactly the kind of game I would expect to see on PlayStation Network.
At first glance -- especially when looking at static images -- it's hard to tell what's so unique about Playbrains' platformer. Your character is actually a two-dimensional painting running around in a three-dimensional urban world.
The PlayStation Blog has a trailer which gets the point across rather nicely. If you happen to be in the San Diego area this weekend, Sideway is playable at Comic-Con (booth #4436).