Igolocal
Note: the domain seems to have lapsed as of 4/26/12, picked up by one of those scumbags that takes them up as soon as they're available. Who knows if they'll pay the ransom to buy it back... Sad day. :(
Igolocal is a Physical Go Server, Location service and Scheduling system by Chuck Thomas in 2010. The system makes heavy use of the Google Maps API with a phpBB backend, and lots of custom PHP and javascript.
Igolocal's original announcement on 30 July 2010:
Starting today, the question: "Where are all the Go players?" finally has an answer. Announcing Igolocal.net, the first Physical Go Server and worldwide Go location service.
From IgoLocal, you can: - Directly find local Go players who match your rank - Challenge them to Games by tagging a time and location on the map - Create open games for anybody in your area to accept - Find and Join local Go clubs - Create a Go Club that will be seen by the entire world - Manage your local schedule of Go-related activities - Register so that other Go players in your area can find you - Use a localized interface is English, German or Japanese, with more languages to come
You can see a complete tutorial and description of the features of Igolocal at:
http://www.igolocal.net/how_to_use.php
The days of sitting home at the computer are coming to an end - It's time to Go Local.
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Update 2013-11-03: There is a new Google map project with the same aim – see World Go Clubs Maps. ___
Update 2016-05-04: There is now an online database of go clubs which you can edit, and which feeds into this map.