As I told you previously Box2D has been used in some games. A good example is the Crayon Physics Deluxe that won the first prize in the Independent Game Festival.
I really like this game. It is very original and simple. When my baby will grow, I will probably get this game. Hopefully, it will be available in a little toy-set instead of using the screen and computer.
Check it out the website of the game by clicking here. You can also check the little video below: