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So, it turns out there are a pretty wide range of screen resolutions across the iOS and Android platforms.
Even something as simple as the icon for the app requires a number of versions to meet requirements.
iOS needs 57x57px icons for iPhone 3G and 3GS (and iPad),

114x114px for iPhone 4,

144x144px for retina display something or other...

and a ginormous 512x512px for the iTunes store.

The files have to be named Icon.png, Icon@2.png and Icon-72.png...and some such
Luckily there's an app for that...
ICONROBOT from FuDesign

Icon Robot (FREE) - iPad 3 supported! from Fu on Vimeo.
Just drag and drop a big image (say a 512x512px jobbie) onto the app and it resizes, renames and saves... superb.
The app is available from a dropbox link here:
IconRobot, not only does the job for iOS, but for Android too, which has its own set of needs:
72x72 px  - icon-hdpi.png,  48x48 px  - icon-mdpi.png,  36x36 px  - icon-ldpi.png

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