I can vouch for the Goldtouch.  I've had one at work for several years, and just picked up one for home off e-bay.  I use a keyboard/mouse tray that is just above my lap.  I've combined the Goldtouch with an Evoluent vertical mouse, and haven't had the aching wrist since I switched.  Works fine with Ubuntu and SLED.

Cons to the Goldtouch keyboard:
The keyboard layout is non-traditional, with no keypad, so I have a separate USB keypad.  When I first got the Goldtouch, I would hit the num-lock key a lot since it is right next to L-Shift.  The num-lock activates the numbers within the keyboard (jkl) and you start typing all sorts of crazy.


Cons to Evoluent vertical mouse:
Doesn't seem big enough (I have pretty large paws), so its a little awkward to right-click. 

I've gotten used to both of them, and they work well for me (YMMV).