I personally like mice and keyboards for input into a computer rather than a touch screen. For general use of a desktop PC, touch screens just aren't practical. They are good for the right purpose. We have touch screen registers at the fast food place I work at, it's practical for that. For general use, I like my monitor a ways away from me, so out of immediate reach if I want to use it for a touch screen... Plus all the smudges you have to clean off the screen. Needless to say, if Windows 7 has a touch screen feature, I won't be using it.
Depending when it comes out, I might just go straight from XP to 7 and skip Vista... Vista still costs too much for me. Windows 7 sounds like to will be so much better losing all the weight of the older setup MS has been using w/ all it's OSes so far.