If you have a PS3 and wait to play something truly unique for $10 you need to try Flower.
http://www.1up.com/do/reviewPage?cId=3172687&p=37 The responsiveness of the sixaxis controller is amazing. The game is a simple concept, you guide the wind and move towards flowers making them bloom and collecting another petal. Its free flying environment looks gorgeous in HD and the soundtrack is great. Its definitely one of the more unique titles for download.
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I also downloaded Linger in Shadows for the hell of it (£2, why not?). Also worth checking out although it's not really a game... just an interactive, err, thing.
Same developer as flOw and Flower.
Just got that and the 10,000 flowers one left.