According to a post on Slashdot: USSTRATCOM tracks and publishes a list
of over 13,000 objects that they currently monitor, including
active/retired satellites and debris. This data is meaningless to most
people, but thanks to Analytical Graphics, it has now been made
accessible free of charge to anyone with a copy of Google Earth. By
grabbing the KMZ, you can not only view all objects tracked in
real-time, but you can also click on them to get more information on the
specific satellite, including viewing its orbit trajectory.
http://www.onorbit.com/node/516
grüsse