As we usher in a new year and say good-bye to the old one, let's take a last look at the ten most watched Big Think videos of 2009.  You, our dear users, voted with your eyeballs.  What can we discern from your collective choices?  That you were interested in love, happiness, money, and sex came as no surprise.  But we could not have predicted that you'd also be taken with immortality, Internet standards, backroom antics at The New York Times, and two British comedians' embrace of nonreligious spirituality. Here the videos are, in decreasing order of popularity: