I'm not the poster above, but the best-known example of propagandizing about them is a paper called "The Fable of the Keys" by Liebowitz and Margolis (
http://www.utdallas.edu/~liebowit/keys1.html), which dragged the Qwerty vs. Dvorak issue into the middle of an academic holy war about the free market. Much of the resulting Qwerty vs. Dvorak arguments have really been about
economics, not their actual merits
as keyboard layouts. (The only argument about the layouts themselves in the paper concerns whether typing on Dvorak is inherently
faster.) The two links lliiffee gave above are by the authors of "The Fable of the Keys" and a newspaper column including a refutation by marketing professor, respectively. (I'm not sure who the "guy in the early twentieth century who had an axe to grind" jerf mentions is, though.)
Now, I really don't care about economic ideology, but I like facts. The Dvorak keyboard places more frequently used letters on the home row than Qwerty* . Also, all of the vowels are on the left hand, which means that typing will generally alternate between hands.
If you agree that it is better to spend most time typing on the home row (to reduce finger travel and general hand contortion/RSI) and to not type several letters in a row on the same hand (compare "reverberated" to "antiskepticism" on Qwerty, for example), then Dvorak is objectively better by your standards. (All bets are off if you're typing in Czech or something, of course.)
* Specifically, "asdfg hjkl;" vs. "aoeui dhtns". Semicolon! I suppose Qwerty could have PrintScrn/SysRq there instead, though.