I was having issues with my wrists. I literally could not type without pain.
Got this Kineses Freestyle w/ 20 inch seperation. Now all is A-okay.

If you get one for yourself, do not let even a drop of water near it. It's very sensitive to water/liquids.
Pedantic trivia warning.
For those of you talking about Dovorak, I'll offer the following trivia. The standard korean keyboard layout is seperated, consonants on the left, vowles on the right. The rules of the language nearly enforce a consonant-vowel-consonant pattern (with exceptions, of course). I still use qwerty when typing roman characters, but I can't type in korean without thinking of Dovorak.
More fun trivia. The first qwerty keyboard was on a product marketed as the typewritter. As a marketing gimic, all the letters in the word typewritter are on the top row of letters... Think you haven't used a typewritter in years? think again.