Hi PH_ART,

The Placemark from Letour is done by Google, based on my work.
I was contacted last week and wee agreed a cooperation.

You can see my name (The frist one) in the description of the placemark.

Live tracking is done completely outside GE!
I wrote a script which performs a series of steps:
1) downloads the letour.fr page
2) extract the current location (km to end)
3) lookup the position on the track to obtain coordinates
4) write the KML file (its pure text)
5) upload the files to the webserver
6) wait 10 seconds and restart.

Its a script written in REBOL containing about 80 lines of code.

For the work on the track I in fact use GE Plus for ease of editing tracks.
I principle one could do the same with any free GIS software.