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An iOS Developer’s take on developing for Android
http://nfarina.com/post/8239634061/ios-to-android
It compares some aspects of developing natively for Android from the perspective of an iOS (and Windows Mobile) developer. Very well done and ties in a bit of the history of some of the differences. For example some UI consequences of changing from a smart phone OS that is more like a Blackberry to something that would compete with an iPhone.
Some nice tidbits for those developing native apps for both platforms.