Earlier in the week, I put up a post about using tag clouds to visualize revision. It's a somewhat problematic approach, as it relies so heavily on lexical repetition, but with that known, it still shows a lot.
Now I see that RLG's Merrilee Proffitt (hi Merrilee!) is using a gadget called Wordle to visualize clouds a bit more ... artfully.
So here we go again: my dissertation, completed in 2005, on Wordle, followed by my book as of 2009: