If you own an iPad it is now easier to design app's. iMockup for the iPad by Endloop Systems Inc. is designed for web designers to mockup apps for the web, the iphone, and ipad. There are grids to make wireframes, you can email the png files, and quickly design and collaborate about your creations.
I'm a graphic design student at the University of Akron. I'm using this blog for my Typography II class where we are posting our Form and Content assignments and also for my Designing for the Web and Devices II class. I'm quite excited for this coming May when I will graduate and a week later marry my best friend!