Hey guys, I've been working on this since early Fall. I want to teach designers the basics of Cocoa & iOS development and also teach hackers how to design & execute great-looking UIs in Photoshop. The larger project tutorials are paid (the first one went live today, over 70 pages including PSD file and Xcode project) but I also wrote a shorter (free) guide to getting started with Objective-C and Cocoa:
http://designthencode.com/scratch/