Thanks for the feedback. #3 was meant to be a more than a little sarcastic, but I guess it didn't mesh well with some of the others.

There are really two types of fragmentation. The first is UI screen size, which isn't too hard to work with. The second, and uglier, is code fragmentation. This is where a piece of code might work totally differently on two separate platforms. Right now Android has a lot of the former, but it's looking like there's a lot of the latter to come.