A cool little Java app, you give it a bunch of text, or a link to a site with an RSS feed, and it generates this highly customizable “word cloud” visualization.
This is one I just did for this blog. Seems about right – me talking a lot about Twitter, books, Kindle, FriendFeed, and people.
You can try it out for yourself at http://wordle.net. Java required, and I couldn’t get it working in Firefox 3 on Mac (worked fine in Safari, though). Post a link in the comments if you come up with an interesting word cloud!