With Clickdensity, you put a bit a JavaScript on your site and it tracks where your visitors are clicking and gives you a heat map of the results. I had the idea for this about a year ago and was going to write it up for the site to see if anyone wanted to collaborate on a prototype, but never got around to it. Nice to see the idea implemented so well.
...is a weblog about the liberal arts 2.0 edited by Jason Kottke since March 1998 (archives). You can read about me and kottke.org here. If you've got questions, concerns, or interesting links, send them along.