The 37 Signals Blog, Signal vs. Noise, has a post about a month ago with an interesting observation:
"Designing for the iPhone is like a hybrid of print and web design."
Their point was with the iPhone, you know the exact size of the screen, you know the exact browser, you know how fonts will look in that browser, you know what the screen is like and all the capabilities. That is so very different from web design, which is rife with uncertainties. In fact, much of web design is coding your way around uncertainties and playing to lowest common denominators.
You can take those dimensions and use them to your full advantage. Such as:
- Design a cool grungy border (don't have to worry about expandability!)
- Browse around stock.xchng and find a cool background image
- Design images for the corners and not worry about fancy coding to get them in the right place
- Open a new Adobe Photoshop document with those dimensions and start designing free of any thoughts of constraint