This is a developer that has gone through all the stages of a iPhone transition from one pane to another. He isn't doing this work, iOS is. It's all done automatically for him. Note how all the parts of the former and latter page fade and move differently in order to create this awesome fluid effect of the iOS operating system. I'm not sure if there has been a similar analysis of Android or WebOS, but I hope they're looking close.
Obviously, detractors will roll their eyes and say that it doesn't even run Flash, so what's the point? But user experience is all in the details, not necessarily in the functions, and the iPhone most certainly has the most refined user experience today.