gVisit is a tool that you can install on your site to see where the last 20-100 visitors to your site came from geographically. It's nothing sophisticated, but it is another example of a site using Google's map API to create something unique, and building on the success of Google's map interface and the company's popularity with the tech community. I expect to see dozens, if not hundreds more apps like this in the near future.

Now, let's all watch and see if Google sandboxes the site thanks to all the links they're getting. :)