Wordle
This site turns text you submit into "word clouds."
You can adjust fonts, color schemes, and a variety of other parameters. Perhaps a functional capability will come to me, but in the meantime it's a pretty good toy.
The Shape of Song
For Bruce Levingston's upcoming album design, Patrick and I were interested in exploring visual representations of musical form. In researching for it, I came across this project: The Shape of Song. They've built a program which diagrams out the connection of notes in arches of varying size - they also have an extensive library of songs... in glorious MIDI.