It isn't up yet (darn West coaster folks)but coming today on Steam:
NASA: Moonbase Alpha (Free Single/Multiplayer Online)
A game featuring:
* Realistic NASA exploration scenarios
* Immersive 3D graphics
* Solo or team play
* VOIP chat
* Alternate voicable text chat
Moonbase Alpha is a game where players step into the role of an exploration team member in a futuristic 3-D lunar settlement.
Their mission is to restore critical systems and oxygen flow after a nearby meteor strike cripples a solar array and life support equipment.
Steam Game Page: Coming