Anyone else playing this? God damn is it good. Most of you probably know about it anyway, but just in case some of you missed it, you can get the demo from the official site: http://www.crayonphysics.com/ It's cheap to buy, though, and the game is pure joy.
What all can you do in it? I saw the footage of the ball going down a hill, but are there other options like heat and freezing, like in that other physics game? Can't remember its name at the moment, it was Japanese or something.
You get pulleys and ropes, and a few other little things. It's reasonably basic, but the flexibility afforded by the ability to create any size shape you want really makes the whole thing unique. I can't remember a game that made me smile as much as this one.
Hmm. That must have been around a while now. I remember playing a game about a year ago that was apparently inspired by Crayon Physics: http://magic.pen.fizzlebot.com/ Fun little (free!) flash game. I'm sure crayon physics is good, too.