Mark is right... In reference to what apple requests. "Ensure your icon is eligible for the visual enhancements iOS adds (if you want them). You should produce an image in PNG format that:
1) Has 90° corners 2) Does not have any shine or gloss"
However, if you want to... say make a beveled border that will look correct after your 90 degree corners are cropped off or "If your design doesn’t have any visual elements that follow or echo the corner radius, then you can safely ignore these measurements"
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Jamie
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"Ensure your icon is eligible for the visual enhancements iOS adds (if you want them). You should produce an image in PNG format that:
1) Has 90° corners
2) Does not have any shine or gloss"
iOS Human Interface Guidelines:
http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/mobilehig/IconsImages/IconsImages.html
However, if you want to... say make a beveled border that will look correct after your 90 degree corners are cropped off or "If your design doesn’t have any visual elements that follow or echo the corner radius, then you can safely ignore these measurements"
This site specifically discusses the radii in icons.
http://hicksdesign.co.uk/journal/ios-icon-corner-radii