Maybe the last Portal-related post until the game comes out (assuming it's released ahead of schedule):
1. I cropped a few screenshots into widescreen wallpapers featuring Atlas and P-Body:
2. I couldn't find a decent image of Chell to turn into a wallpaper, but here's Chell
model/voice actress Alésia Glidewell:
3. And here's some of the Portal-themed levels from Valve's Potato Sack bundle:
Portal in Rush.
Portal in The Ball.
Portal in Bit.Trip.Beat.
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Preorder Portal 2 at Amazon and receive a $20 credit.