Mystique, the first game ported to the iPhone
Bendroid, a small team of Android App developers have been the first to successfully port their game Mystique from the Android OS to the iPhone OS!
Quite a few applications have been ported over from the iPhone to the Android OS, but not the other way around. Perhaps this is a sign that people are valuing Android applications more as the phones start to gain popularity in the market place.
View Mystique on 101 Best Android Apps
View Mystique on 101 Best iPhone Apps