This evening I was playing around with Wordle (which makes gorgeous word clouds from user-provided text) in preparation for an in-class exercise in my intro linguistic anthropology class tomorrow. And of course I ended up throwing other chunks of text in there, including this rather fetching visual representation of chapter 13 (the conclusion) of Numerical Notation:
Glossographia 
Have you seen Tagxedo? It is like Wordle but has some additional interesting features, such as the ability to fill a specific shape. You can even upload a graphic and make the word art in the shape of the image.