Apple Insider's got the latest on yet another Apple patent application, this one for not just touch sensitive screens, but for pressure sensitive touchscreens. Right now, the iPhone can tell where you're touching it, but not how hard you're pressing on it. The device described in the patent could do just that, and use the force information "for purposes of providing command and control signals to an associated electronic device."
Pretty interesting. I can't think of a great use for it besides the one Wacom and other high-end input tablets already use (the harder you press, the darker mark you can make with a virtual pencil), but then again, I'm not an award-winning user interface designer (just a pretty average user interface user). Who knows what Apple could come up with using an interface like this-- maybe flip through CoverFlow albums front-to-back as well as horizontally?
Of course, like all patents, as AI notes, Apple has no obligation to actually use this design in any of their products. But just in case you needed any more hints that they're not walking away from a touchscreen interface anytime soon, here you go.