- They finally replaced the hardwired keypad with more reasonable controls for a gidital device.
- They seemed to grasp how to use adaptive interfaces in a way Microsoft never figured out.
- They realized that a touch-screen is normally touched with the most powerful point-and-manipulate devices known to man.
Of course, since it is a revolution by evolution, that (hopefully) means it's better than what came before, but still not perfect. The most interesting discussion I think is Tog's view at The iPhone User Experience: A First Look. It is a very thorough review, with an interesting discussion of the amazing intuitability of the multi-touch screen and the history of the "pinch-spread" interface. (Shoulda patented, Tog). And Ryan Pearson's Everything's got a down side describes network compatibitily and storage expansion problems, and more importantly the longevity limits of touchscreen hardware.