T'other kind is, indeed, the Dvorak keyboard which I learned, from Googling Dvorak and going to a very interesting site, was invented in the 1920's to make typing more efficient, since the qwerty layout was devised to slow up typists (so the type bars on the old manuals wouldn't jam). After WWII, a U.S. Army officer who had lost an arm asked Dr. Dvorak to come up with a modification of the keyboard layout which he could use with one hand. Dr. D came up with two -- the Dvorak Right Hand layout and the Left Hand Layout. These are extremely interesting; you can see a chart in the website. They are, apparantly sold quite often, as there are lots of people who have the use of only one hand. And it is also possible to reconfigure you own keyboard to any of the 3 Dvorak layouts (left, right or two-hand) without having to buy a new one.