I found a rather weird AdWords trick on this page: http://www.vex.net/parnassus/ There is a AdSense ad on that page that reads "Python jobs at Dice". I clicked on that because I was genuinely interested in that. When I clicked on that I was forwarded to a link: ad.doubleclick.net/clk;17966612;11534428;j?http://seeker.dice.com/jobsearch/servlet/JobSearch?op=1013&FREE_TEXT=python&Google_PPC Essentially Dice.com is generating ad revenue by generating doubleclick.net clicks though AdWords. Is this allowed?
I think it's just a click-tracker. Nothing unusual (as far as I can tell -- unless they took it down )