The classic disproof of the Dvorak superiority to qwerty is "The Fable of the Keys", here <a href="http://www.utdallas.edu/~liebowit/keys1.html" rel="nofollow">http://www.utdallas.edu/~liebowit/keys1.html</a> , which was also the lead chapter in the authors' book "Losers, Winners, and Microsoft", a general attack on network (or lock-in) effects.