Adobe Photoshop: 50+ High Quality .PSD Files and Tutorials -
A collection of useful .PSD files and tutorials.
How to Animate a Demo of an iPad App with Photoshop
http://iphoneized.com/2009/11/21-prototyping-mockup-wireframing-tools-iphone-app-development/
Fireworks IPhone mockup toolkit
IPhone & Android Wireframing Tools - http://www.teehanlax.com/downloads/