What is a good Mac objective-c 2D game engine?

Question

Now that Apple is going to release the Mac App Store there is bound to be lots of games. I'm curious, in your opinion, what is a good Mac 2D game engine to use for game development that has an objective-c interface?

Thanks

Answer 1

Cocos2D which I understand is popular for the iPhone also now has Mac support.

Disclaimer: I haven't tried it.

Answer 2

Currently the most widely popular is Cocos2D, although I would suggest to go with either Kobold2D (free) or KoboldTouch (subscription, in active development).