Here's the datahand I'm using at home (I've got another one at the office). It's way cool, though expensive, but it's the only keyboard I can use without experiencing pain in my hands and forearms. If you're a touch typist you get used to it within a few days and can even improve your typing speed.

Here are close-ups of both hands.

As you can see, there are always exactly five keys for each finger, the layout is printed on the keyboard. It's basically qwerty, so you can adapt soon, provided you're a touch typist.

The right thumb has backspace, alt, NAS (Numbers and Symbols), space and mouse-mode (giving you a mouse under both of your index fingers -- quite usable but nothing for graphics applications). The left thumb has normal (switching back from mouse-mode and NAS-lock), return, shif/caps-lock, tab and control.

The big screw on the left/right side of the hands adjust the height of the finger rows. There are also two screws/dials near the thumbs which adjust the position of the finger rows according to your finger length. As you can see, I cut the lower edge of the palm pads off so my wrists couldn't rest on them.

Overall a great keyboard for anyone with RSI or similar problems, if you can swing the bucks.

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