I'll concede ergonomics anecdotally, but none of the studies of Dvorak were at all rigorous (the most-cited Navy study was overseen by Dvorak himself).  And the 'slow typists down' thing is a myth.  Also EMACS RULES VI DROOLS WOOOOOOO!

"Well", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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I'll concede ergonomics anecdotally, but none of the studies of Dvorak were at all rigorous (the most-cited Navy study was overseen by Dvorak himself). And the 'slow typists down' thing is a myth. Also EMACS RULES VI DROOLS WOOOOOOO!