The Dvorak layout was designed to address the problems of inefficiency and fatigue which characterized the QWERTY keyboard layout. The QWERTY layout was introduced in the 1860s, being used on the first commercially-successful typewriter, the machine invented by Christopher Sholes. The QWERTY layout was designed so that successive keystrokes would alternate between sides of the keyboard so as to avoid jams. Some sources also claim that the QWERTY layout was designed to slow down typing speed to further reduce jamming.
Improvements in typewriter design made key jams less of a problem, but the introduction of the electric typewriter in the 1930s made typist fatigue more of a problem. This caused an increase in interest in the Dvorak layout.
http://en.wikipedia.org/wiki/Dvorak_layout
I’ve been using it since August and the improvement in speed is amazing! The keyboard seems to vanish and all that is left is your mind and a screen! + you don’t get tired at all even if you type 24/7... Check it out, it’s bundled with your OS whatever it is.

