This is what I have in my Info.plist for the icons of all supported devices (ipod, iphone, retina display, ipad):
The @2x
files refer to retina display. The -72
refer to ipad.
EDIT:
This is the textual representation of the list above in my info.plist file:
<key>Icon files</key>
<array>
<string>Icon.png</string>
<string>Icon@2x.png</string>
<string>Icon-72.png</string>
<string>Icon-Small-50.png</string>
<string>Icon-Small.png</string>
<string>Icon-Small@2x.png</string>
</array>
XCode 4 EDIT;
As of Xcode 4, the best way to set the icons for your app is to access the Summary pane of your target settings, as displayed in the image below, and drag-drop the icons on the available controls (separately for iPhone and iPad, retina and non-retina).
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