Cocos2d Menu Tutorial

Getting Started with Cocos2d

Cocos2D for iPhone is a great open source framework that makes it easy to make some very impressive 2d games with much less effort than having to know OpenGL directly or rely on a third party system that might have performance issues or be unnecessarily bloated.   From the official cocos2d for iphone website:

Cocos2D for iPhone is a framework for building 2D games, demos, and other graphical/interactive applications. It is based on the cocos2d design: it uses the same concepts, but instead of using python it uses Objective-C.”