Locating a blog(er) in physical space

At the suggestion of an interesting article from the Shifted Librarian, I've added a couple of META tags to my home page to note the location of my blog in physical space (or at least where my computer is).  The post that Jenny was was taken from the Syndic8 service; I don't know of any generalized service that will show you who's blogging near you.  But a lot of this effort is about leaving breadcrumbs and see who might follow them in the future.