Stardust

The ultimate in procrastination.

Nasa needs volunteers to spot dust particles collected from distant stars. The dust is stuck to a gel and in order to find the individual dust particles Nasa has used a scanning microscope to upload millions of pictures of the gel.
Bored people can then sign up to look for the grains of dust in the pictures and help Nasa's scientists. There's even a scoreboard for you competitive types and the best dust pickers will be co-authors on any publications involving the Stardust project.

http://stardustathome.ssl.berkeley.edu/about.php