If you read through the Apple SDK documentation for the iPhone it's stated that the dimensions you are working with are NOT pixels. On the iPhone and iPod, the

If you read through the Apple SDK documentation for the iPhone it's stated that the dimensions you are working with are NOT pixels. On the iPhone and iPod, the dimensions you are working with scale 1:1 to pixels, but that you should keep in mind the scale will be different with future devices. So all apps will scale automatically to bigger screens. And it seems that they planned from the start that bigger screens would come along.