N: Puzzle-Platformer with Physics and Style

I came across this the other day while reading Penny Arcade. This flash game has got it going on. It's a download, I know, but don't worry. No installation required. I thought I would dink around with it for a little bit, and here I am playing it several days later. Great way to kill some time. Did I mention it's free? Just play a couple of levels and tell me you don't like it.