I just read Cory's article about this and had to try it out. Looks great! I've seen these tag clouds used a few times before without having any idea what they were supposed to be. One question: is there any way to have it reread the "notes" file periodically without having to stop/start the script?
For the curious, the article is located at http://www.locusmag.com/Perspectives/2009/05/cory-doctorow-extreme-geek.html