From the site:
GeoURL is a location-to-URL reverse directory. This will allow you to find URLs by their proximity to a given location. Find your neighbor's blog, perhaps, or the web page of the restaurants near you. GeoURL is listing 516,559 sites.
To be added to the geo-index, one just need to add a couple of meta tags on his homepage, and then tell the server to crawl that URL. Then, one can discovers websites or blogs within a certain range from his location, setup an RSS feed to be notified about new near websites, etc.
Link: GeoURL (2.0)