The NASA Ames Intelligent Robotics Group is using Google Earth as part of the communication of their robotic field test up in the Arctic region of Canada:
From July 10 through August 3, 2007, the Intelligent Robotics Group is conducting a robotic field test in Haughton Crater (Devon Island, Canada). Two NASA Ames K10 rovers, "Red" and "Black", will be used to perform surveys of several simulated lunar outpost sites, including a roughly 700m x 700m region called "Drill Hill." The rovers will carry ground penetrating radar to map subsurface structure and a 3D scanning laser to map terrain topography.
For all I know it could be the real thing taking place on the Moon right now. And I just read
that NASA on a slow month has some 4 million unique visitors to its portal...from the US alone.