Hopefully someone else will find these useful. Distilled from the Apple guide
- Icon.png – Home screen icon for iPhone 3 (57×57)
- Icon@2x.png – Home screen icon for iPhone 4 (114×114)
- Icon-72.png – Home screen icon for iPad (72×72)
- Icon-Small.png - Settings/Spotlight icon for iPhone 3 (29×29)
- Icon-Small@2x.png – Settings/Spotlight icon for iPhone 4 (58×58)
- Icon-Small-50.png – Spotlight icon for iPad (50×50)
- iTunesArtwork – Icon for iTunes AdHoc distribution (512×512)
Had a request to make the work flow a little easier heres those icons in descending size order
- iTunesArtwork – Icon for iTunes AdHoc distribution (512×512)
- Icon@2x.png – Home screen icon for iPhone 4 (114×114)
- Icon-72.png – Home screen icon for iPad (72×72)
- Icon-Small@2x.png – Settings/Spotlight icon for iPhone 4 (58×58)
- Icon.png – Home screen icon for iPhone 3 (57×57)
- Icon-Small-50.png – Spotlight icon for iPad (50×50)
- Icon-Small.png - Settings/Spotlight icon for iPhone 3 (29×29)
I made an app for doing this, and it’s now available in the mac app store.
http://itunes.apple.com/us/app/iconizer/id412346451?mt=12
It will re-size your icons to all 7 sizes, and it also does previews with the gloss and rounded corners so you can test out what it will look like on-device.