@bdinger: I agree with you in that these are not replacements for normal computers. I use a laptop with puppy linux when I am away from my desktop. Although I enjoy the lack of distractions for a while, I can't use it more than a few days for risk of insanity.

Assuming you have two mirrors, you could always just twist one such that you can look backwards. Much cheaper, more reliable, and I will come slash your tires if you don't know how to adjust a mirror.