Pre-Order Crayon Physics Deluxe - 5$ off & Beta

http://www.crayonphysics.com/

Almost tempted.

Looks amazing.
It's one of those games that I'd spend hours just looking at it working out how to program the same.

It looks like great fun. Even if it's not fun, it's an astonishing feat of programming. If I played PC games I'd buy it in a shot.