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I came across an interesting web service today. GeoURL maintains a database of the physical locations of websites. Which is pretty neat in itself, but the site also offers a "neighbours" look up tool which lists other websites nearby...
This is a pretty cool idea. GeoURL allows you to control the range (in miles) of neighbouring websites. So, if you're ever stuck for somewhere to go on the Internet, why not visit the neighbours?
These websites are within 100 miles of the Urban Mainframe.