Remember the User (IPhone Application Development)

I’ve been singing this song since topic 1, and I’m still singing it now: Keep your app simple and easy to use. Don’t build long pages that take lots of scrolling to get through, and don’t create really deep hierarchies. Focus on what the user wants to accomplish, and be mindful of the device limitations, especially battery life. And don’t forget international roaming charges.
In other words, try to follow the Apple’s iPhone Human Interface Guidelines, found with all the other documentation in the iPhone Dev Center Web site at http://developer.apple.com/iphone/ under the iPhone Reference Library section — Required Reading. Don’t even think about bending those rules until you really, really understand them.