I put the urchin.js file on commadot a month ago. It is a little file that tells Google everything that is happening on this page. It’s quite amazing actually. Really solid user interface. (Much better than AdWords) Great information. Nice use of Flash, where appropriate.
And you can mouse over the little dots and see how many and what the name of the city is. The one in the middle of the Pacific Ocean is either Hawaii or a guy with a waterproof laptop interesting in the Jets and User Experience Design.
Sometimes Google is so great about UX and sometimes they are so bad. I guess that is not bad for a gazillion dollar company with a trillion employees.