Update:
As I don't use trackMe client any more I stopped working on this project.
Instead I develop my own server-client solution, see:
https://github.com/bfabiszewski/ulogger-server
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This is a simple web viewer for GPS tracks uploaded with mobile client.
It is designed to work with Android version of great app TrackMe (http://www.luisespinosa.com/trackme_eng.html), 
but it should be easy to adjust it for other clients (other database tables).
Interface "look and feel" is based on TrackMe Display (http://forum.xda-developers.com/showthread.php?t=477394).
It is possible to switch between Google Maps API and OpenLayers API with OpenStreetMap (or any other compatible base layer).
It also supports Backitude client (thanks to markcs: see README_Backitude).

Live demo:
- http://flaa.fabiszewski.net/phptrackme/

Requirements:
- PHP 5.1.2
- MYSQL 4.1
- browser with javascript enabled, cookies for authentication and saving preferences

Features:
- simple
- allows live tracking
- track statistics
- altitudes graph
- multiple users
- user authentication
- Google Maps API v3
- OpenLayers v2
- ajax 
- server based configuration
- user preferences stored in cookies

Todo
- install script
- custom icons
- write opensource client?

License
- GPL