One thing that's always blown me away about the TouchWheel iPod and the original iPhone is the mountain of design/engineering work beneath a very simple user ex

One thing that's always blown me away about the TouchWheel iPod and the original iPhone is the mountain of design/engineering work beneath a very simple user experience. It's what competitors found hard to replicate when these products were first launched. Nobody ever talks about the kinetic scrolling behavior as a marketable feature on paper. But for the end customer, it builds the image of "it just works" very convincingly.