MyLatitude
This is an entirely open-source clone of Google's Latitude functionality that you can self-host. Don't know what any of that means? You may be in the wrong place.
Install
In the app root, launch the shell and execute install().
It will notify you when the procedure has completed.
Server
You can update your location on this site with your android phone quite easily. Just install Backitude on your phone and configure it to POST to this application.
(Note: will not work begind NAT.)
This will allow you to view your mobile device's location at your dashboard.
Config
TODO: write an easy how-to config