The calender app does it... How can I make an app icon change based on stored info from the iPod or iPod app settings?
EDIT: I realized today that it is possible to access bundles via the sdk. (At least read access) If I had a graphics API (OpenGL, perhaps) then I could possibly modify the icon like that. The operation would be:
Does that make sense?
Unfortunately you can't use the SDK (which of course Apple isn't restricted to with the Calendar app) – you can do badges but the image is always static.