Backitude is an android application that allows users to track their device locations in a highly configurable and continuous manner. Location data can be stored locally as (KML, CSV) or posted to a custom server. Anyone can create their own server implementation for storing or sharing location data.
Currently, three users are sharing their implementations:
http://backitude.ascanwex.de/ ([email protected])
https://bitbucket.org/nparley/mylatitude/wiki/Home ([email protected])
http://www.backituders.com ([email protected])
Let me know if more exist you would like me to add to the list!