www.thatgamecompany.comFind flOw on there. It is absolutely brilliant. You can also buy it for PS3 and PSP. Just freakin' play it!
EDIT:-
Here are some of my own screenshots from the PS3 version:-
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[box=Screenshot 2]

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[box=Screenshot 3]

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how do you play it i may ask?
yes how do you play it?? also what is it about??
:D
'FlOw is a game about piloting an aquatic organism through a surreal biosphere where players consume other organisms, evolve, and advance their organisms to the abyss.'
That's what the page says about the game.
PC, your mouse cursor guides the worm type thing. PS3, you tilt the controller to move, and on PSP, you use he analogue stick/nub/etc.
Starforce is right, you play a micro organism who has to go eat everything in sight. PS3 and PSP version as loads of different unlockable organisms, whilst the PC version has only 2.