I love it when XKCD makes me go learn something new. Today's hover-text mentioned the Kepler mission, so I went to the interwebz to learn about it.
After posting a status about it to FaceBook one of my friends from work pops up with the fact that his wife works with one of the astronomers who developed the Kepler mission.
From Nature, Jan. 3, 2008 -
Extrasolar Planets by Dimitar D. Sasselov.
His personal site is here:
http://www.cfa.harvard.edu/~sasselov/ xkcd.com - #638