it's a google ad. Each one of us gets a different ad in that spot. Google tracks where you are, what you are doing on the web and decides how to personalize the add you are going to see.
the scary part is that they know more about you than your wife!
pierre
p.s. and no, I am not kidding! Target for example knows when a woman is pregnant before she does. They use the changes in shopping preferences to figure it out.