Hi, our Othello based game "flipNgive" was released by Apple this week. We used Chipmunk in a series of mini-games, where users take their points and try to multiply them before posting their high scores -- it's a bit like gambling with physics!
We used UIKit exclusively, and Chipmunk is used to manipulate UIImage elements directly with 20 ~ 30fps. Typical collision sim contains 20 or so cpBody (circles) and several cpSlideJoints to form a chain link. Worst performance is 10fps when a simple particle system is used to collide "bubbles and balls," the performance hit seems to be in the nature of the dynamic allocation/destruction of particles. Pre-allocation of the particle system would help, of course.
The social aspect of this game seems pretty interesting. It's getting to the point where you really have to have some sort of social interaction built into your app to get it noticed on the iPhone anymore. You'll have to let us know how that works out for you.
Can't sleep... Chipmunks will eat me...
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