[NOTE: the live tracking in this article was for 2006 ONLY. Here is a link to the 2007 Tour de France route in Google Earth.]
After several comments from users about confusion with recent enhancements to the Tour de France live tracking capabilities, I contacted the author about the problems. He has now revamped the live tracking interface for Tour de France 2006 
by having a folder which contains network links for several of the bikes in the race, and another folder which contains a list of camera network links you can turn on which give you tilted views, general views, and close up views of the racers’ positions. If you are using GE 4 the list of camera views are radio buttons so you just toggle between each view. In addition, he added a feature which tells you when the next stage begins when the racers are finished with a stage. Read more about this tool in the original GEB story.
About Frank Taylor
Frank Taylor started the Google Earth Blog in July, 2005 shortly after Google Earth was first released. He has worked with 3D computer graphics and VR for many years and was very impressed with this exciting product. Frank completed a 5.5 year circumnavigation of the earth by sailboat in June 2015 which you can read about at Tahina Expedition, and is a licensed pilot, backpacker, diver, and photographer.
I provide another way to track on real time the Tour on my website :
http://www.routefocus.com
I equipped 3 cars, 2 from BOUYGUES TELECOM team with a GPS. You cab track it dowloading my freeware on my website. Enjoy it !