I've been trying to figure out where/if I might be able to make use of one of these UMPC things, and I'm coming up blank. That radial typing madness seems only useful for short messages, like you'd send with a Blackberry, but then why not have a Blackberry?
I suppose if you were a travelling salesman and your main thing to do on the road was PowerPoint, one of these gizmos might make sense. Likewise, if you wanted a portable video player, one of these UMPC's might be more useful than the tiny screen on an iPod. And, of course, you can see them in all sorts of vertical applications.