I have Spybot running in the background.
Several times now I got the message that it had blocked the download of  "/DoubleClick". That happened in the forums as well as in the market place. 
I think that a professional site such as this one should be free of things like that (and in fact it has been for a long time). Maybe somebody is abusing Renderosity for their shady aims? Or is my spybot lying?
Perhaps somebody from the team could clarify what's the matter here ;)