From part 3 of Inside Bush's space plan at http://www.spaceref.com/news/viewnews.html?id=918

The commercial industry could be a different story, however. Aerospace companies might be able to supply small communications satellites orbiting the moon, for example, keeping landing parties in touch with Earth, even if they traveled to the moon's far side. In fact, the issue of how to leverage commercial space entrepreneurs or companies -- even universities -- into a new attempt at moon landings was taken seriously.
Potential private partners could contribute in various ways. A Global Positioning System or GPS satellite system in lunar orbit could guide all incoming craft to precision lunar landings. If operational, such a system could allow smaller space vehicles with crews to land near cargos previously dropped down from orbit nearby. In that way, mission planners could simplify the complexity of the moon lander's electronics, keeping costs down.

Perhaps this is one reason why Lockheed Martin is upgrading its west coast launch complex for Atlas 5 launches.

I wonder how much trouble it will be maintaining a satellite in lunar orbit.

SteveS