Crowd-sourcing the search would also give professional astronomers time to focus on more important things – like mapping the course of meteors that could strike the Earth and destroy civilization – or trivial things like figuring out their belief that 95 percent of the mass of the universe is invisible to humans isn't insane or a gross miscalculation.
Forget SETI@Home, sign up for Aliens On Moon
Good old volunteer investigators, on the other hand, could find harder evidence of alien landings than crop circles, or even settle the other paranoid fantasy about the moon: That the whole "moon landing" thing was staged by Hollywood at the behest of The Government to trick the Russians, or sell more Wheaties or Tang or something. (Men in Black III is coming out May 25, 2012, by the way; here's the trailer.)
So if you have time and interest to pore over hundreds of high-resolution photos of gray meteor dust piled on airless rock, or have a telescope you use to watch things more celestial than your surprisingly limber neighbors, check seti.org once in a while, or NASA's Lunar Reconnaissance Orbiter Twitter feed.
No one has agreed to sponsor or participate in a crowd-sourced search for aliens on the moon, but you never know.
NASA has lots of astronomers, most of whom are sure to know the Mayan calendar runs out in 2012, which might give NASA decision-makers some sense of urgency about finding aliens before the End of Time. (Though both the NASAi with knowledge and those who make decisions are also pretty sure to know that just means we're missing the last stone tablet carved with the Mayan equivalent of 'Please order calendar refills, or upgrade to Mayan Calendar 2: Papyrus.')
And who knows, with enough pictures, examined by enough people, maybe people will begin to understand the distance, physics and importance of the universe outside our atmosphere well enough that they might be willing to actually pay to explore it.
Or, at the very least, with enough eyes on Neal Armstrong's footprints and the big piles of junk humans left on the moon, maybe they'll begin to believe that even humans might be capable of travelling through space as far as the moon, even if they don't come back to kidnap and probe people from trailer parks as proof they'd been there.