I was using the tablet function, of the computer I work on, for the first time yesterday. It's much easier to edit images and the handwriting recognition is a lot of fun. I would go as far as saying the 'pencil and paper' feel doubles productivity for editing images. On the other end, I prefer typing to writing and find it faster.
A few weeks ago John got a one handed keyboard called a Frog Pad and I've recently become very curious about using one. If it weren't for the high price I would think of buying one. Reviews seem to indicate that a normal QWERTY keyboard is much faster for typing, even with one hand; but the mini keyboard screams, "GAME WITH ME!" With all keyboard buttons (save the F-keys) accessible to a single hand with minimal movement, one could keep their hand centered on the keyboard, have access to all of the keys and have the other hand entirely free for the mouse.