I just added to the collection of icons at the bottom of the right sidebar.
GeoURL tracks web sites by location. To it looks for meta tags in the <head> parts of pages. If you click on you will get a page of wed sites located near me.
Unfortunately, GeoURL doesn't yet have an interface to Google Maps.
On the other hand, , which lists blogs by keyword, has a beta version of a Google Maps - Blog Search for blogs by GeoURL. When you open it you get a local map of the place in England where Blogwise was created. To use their interace, navigate on the map and then click refresh to get a new list of local blogs.