Never posted this on 10-10th for some reason but just done an update to my Google Earth file which has been done by myself with help from the main circuit websites and guys off AtlasF1.
There are over 1000 tracks etc on there.
The latest version 4 of GE is required to benefit from the paths and layouts I've added.
Enjoy.
http://www.exige.me.uk/motorsport.zip