I just want a very long-life note-taking tablet with a decent keyboard. There's a reason the old Tandy 100 is still in use by a handful of journalists. Nothing has really taken the place of it, as far as I know.
The Kindle keyboard isn't comfortable enough to write a book or an article on; phone keyboards are too small and editing too much of a chore (I'd use vim on my Nexus One if it weren't such a damned hassle to hit Esc and some of the other special keys). I currently use a netbook for this purpose, but the battery life is too short at only a couple of hours. I can't go to the park and knock out a chapter in two hours, and rebooting to change batteries every two hours would be a productivity killer, even if I wanted to spend a bunch of money on spares and go to the trouble to keep them charged.
I guess I'm just not the niche for this device, as I can't imagine ever using it for anything.