I just thought of a cool, yet simple, app idea. what if there was an app that would display rulers? they could be perfectly formatted images so that they were exactly to scale on the iphone or ipod touch screen, and the app could be a simple photo viewer. the only real requirements are that the ruler is to scale, has inches and centimeters, and smaller marks (like milimeters) also, it would be better if it hid the status bar aswell. so I will give it a try, but if you have anything that might help just say so, or try yourself. because it never matters how an app is created, as long as you can use it to its full potential.