Most of the touch-screen demos I've seen seem to have all discovered inertial scrolling. I think it's almost inevitable that, once you have a tactile interface,

Most of the touch-screen demos I've seen seem to have all discovered inertial scrolling. I think it's almost inevitable that, once you have a tactile interface, the expectations of real-world behaviors when interacting come out. Most of the pre-iphone interfaces all focused on being menu-driven with buttons or scrolling with mice, so that natural discovery couldn't occur.