Well, I really like having a touch-screen computer. The last two main computers I've had have been those neat little "convertible" laptops that have the 360-degree hinges that let them fold into tablets. I mainly use the keyboard and trackpad the way someone who has a non-touch computer would, but I like having the touchscreen and the ability to fold it into a tablet for the times I do use those features. The one I currently have actually has a neat little pen too.
Mind you, touchscreen computers have become WAY more mainstream since this thread was posted (at my college, almost everyone who doesn't have a MacBook seems to have a touch screen laptop), and Windows has become FAR more touch-friendly, even getting too touch friendly there with Windows 8. I probably would've passed on a touchscreen computer back then (ESPECIALLY with Vista).
My main annoyances with having the touchscreen (and they're pretty minor) are the screen getting all smudged, and classmates touching the screen when I'm working on a group project not knowing I have a touchscreen laptop.