Maybe it's my complete lack of imagination, but when I look at the clumsy, big UI-elements of finger driven devices (and this includes those absurdly big menus and scrollbars in OS2008), I don't see how they could efficiently handle menus and dialogues with lots of options. Somthing like XChat, for example, with its sub-menus and 100 options... it's hard for me to imagine how a finger-driven UI could handle all this without breaking it down into even more sub-menus and sub-sub-windows/tabs, thus making it totally unusable. (But, as I said, maybe it's just my lack of imagination. Surprise me with something that works. I still wouldn't use it because I hate finger taps on my screen, but it'd be interesting to see.)