For those of us who have lamented the apparent demise of GeoURL, there is A2B, a new geolocation service. If you want to add a button which links to a search for the websites nearest your own, that information is hidden in the “User details” area, under the “Websites added” page. Yes, you have to register with the service to use some of the features.
They’ve also got some nifty tools for those of you who are GPS-enabled when you’re out and about. Like being able to find “what sites are near my current location”? And there are more features planned which sound like they’ll be quite useful. If you don’t already know your lat/long coordinates, they’ve got links to several mapping sites that can help you out. Get your geo on!