Created by Travis Kirton, C4 is a brand new creative-coding framework for the iOS that lets you build expressive user experiences. C4 gives you the power of the native iOS programming environment with a simplified API that lets you get down to working with media right away. “Build artworks, design interfaces, explore new possibilities of working with media and interaction.”
We've just launched the project and it was already featured on Creative Applications http://www.creativeapplications.net/iphone/c4-new-creative-coding-framework-for-the-ios/.
If you are interested in building new kinds of interactive applications for iPhone, iPad and iPod devices, then you should definitely have a look at C4.