This tool allows you to traceroute to an ip address on the Internet with Google Maps showing you the path that it takes. Enter your own ip address to see how it works, or choose from a number of preset sites like Blogger and Microsoft. Be patient with this site as it takes a bit of time for the traceroute to take place, then display in the map window.
Not sure what a traceroute is? A traceroute is basically the path that things requests to view webpages take or the route that an email might take to reach it's final destination. For a more indepth description check here.