This is a pretty cool use of Google Maps. You tell it the URL of your site, and it gives you a small piece of Javascript code. You stick that in the <head> section of your site, and it will plot where your site visitors are on a Google Map. Here is the map for my personal site.
If you stick with the free version, it maps only the 20 most recent visitors. You can make a donation of any amount and get the 100 most recent visitors. You can even tweak the URL of the map page to show IP addresses.
Hat tip Ian
Okay, that’s pretty darn cool.