New Scientist is carrying this article detailing efforts to protect future lunar astronauts from something nobody seems to have mentioned before:

A meteoroid blasting through a Moon base would be a bad day in space. So, with NASA now planning to return astronauts to the Moon as early as 2018, scientists are combing through 30-year-old seismic data to see exactly how big a threat impacts pose to future lunar explorers.

So much for the "useless" Apollo missions, eh?