OrbiTouch keyboard and left-hand Dvorak keyboards

I'm considering getting an OrbiTouch keyboard. If someone has one, I'd
love to hear your thoughts on it. It is slow enough that I can't
imagine that it'll become my only keyboard, so I'm definitely keeping
my Kinesis, but I suspect that I can use it when I'm not typing much.

I'm also considering a left-handed one-handed Dvorak keyboard for my
desktop. It's easier on my wrists in the same way a separated
two-handed keyboard would be, and it allows more flexibility in
workstation arrangement. I've been using left-hand Dvorak on my Eee PC
for a while and am pretty fast with it. Are there any keyboards
designed specifically for one-handed Dvoraks, or are there any small
keyboards (letter section about 225 mm wide) with matrix layouts or
other interesting features that I should consider?

Tom