Open Source Location Service

In ReadwriteWeb:  " ... Until now, Ushahidi has been most known as a service for reporting location during times of crisis ... Today, the company has taken a bit of a turn with the release of its open-source check-in service. Now, anyone with a bit of PHP knowledge and a server can create a Foursquare, Gowalla, Facebook Places or check-in service of their own and keep their location data out of the hands of the public and corporate alike ... "