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Universal apps icon requirements. Image Size (px) File Name Used For Required Status 512x512 iTunesArtwork Ad Hoc iTunes Optional but recommended 114x114 Icon@2x.png Home screen for iPhone 4 High Resolution Optional but recommended 72x72 Icon-72.png Home screen for iPad compatibility Optional but recommended 58x58 Icon-Small@2x.png Spotlight and Settings for iPhone 4 High Resolution Recommended if you have a Settings bundle, otherwise optional but recommended 57x57 Icon.png App Store and Home screen on iPhone/iPod touch Required 50x50 Icon-Small-50.png Spotlight for iPad compatibility Recommended if you have a Settings bundle, otherwise optional but recommended 29x29 Icon-Small.png Spotlight and Settings Optional but recommended corner radius for the 512x512 =  80  (iTunesArtwork) corner radius for the 114x114 =  18  (iPhone/iPod touch (Retina)) corner radius for the 72x72 =  11 ...

http://cocoacontrols.com/

http://www.raywenderlich.com/tutorials awesome source Some CG Functions http://blogs.oreilly.com/iphone/2008/12/useful-core-graphics-functions.html

Briefs is a framework for packaging concept screens & control schemes that run live on the iPhone and iPod Touch. This allows you to experience the feel of your concept without the expense of development. Go to http://giveabrief.com/ for the source code and instruction on getting your application wireframe up and running..