http://www.galaxyzoo.org/
Started by Chris Lintott, from The Sky At Night on the BBC - This is an attempt to get people's meat-computers to help the large task of classifying galaxies.
As the project moves on, they'll be introducing new features they'd like identified.
So, if you like looking at lots of pretty pictures of hitherto studied galaxies, why not give them a hand?
{Reminds me of this Google Tech Talk about CAPTCH by Luis von Ahn
(R/t 50mins - but well worth it)
http://video.google.com/videoplay?docid=-8246463980976635143}