I've recently tested an OpenGL ES based 2D game on the iPhone 4. I've done almost all of the development and testing so far on my 3G device. The game works fine (except for a few multitasking things) on the new device. I'd like to replace some of the artwork w/ "better" artwork that takes advantage of the iPhone 4's higher resolution. How can I do this?
Is there a flag somewhere that tells the phone to scale up some or all of the image resources?