Just a quick one here today, for some time spammers have been using Google adword URLs to perpetrate their spam.
Example:
http://www.google.com/pagead/iclk?sa=l&ai=ukeaFe&num=65293&adurl=http://westphoto.org/redir.htmlThis is pretty much what they do below:
http://{google domain}/pagead/iclk?sa=l&ai={6 random letters}&num={5 random numbers}&adurl={http://www.example.com/}NOTE: Everything inside the {}, including the {} are no what you will see in the URL
While you can see the URL at the end that they are trying to get you to see, most anti-spam systems will thinks it Google and will resolve it as Google.