#AEIconizer This plugin makes your life easy when you need to resize artwork for iOS app icon.
You can see it in more detail on Vimeo.
After creating icon in any square sized artboard, select any layer (or nothing if that's the only artboard on page), then run this plugin to generate all of the needed sizes for iOS.
Plugin replaces all generated artboards every time it runs, but it will never delete your original artboard.