I just found a neat site: GeoURL ICBM Address Server. You register the latitude and longitude of your web site (or your location if the web server housing your site is elsewhere, as in my case) with GeoURL, and they will then show you all the other websites they have registered in proximity to you. Neat!
Right off the bat I see that within 4 miles of me is UtterlyBoring.com, a blog site run by another local computer geek.
Damn, this is what the internet is all about.