Washington post "FBI, SEC and US Postal Inspection Service are investigating click fraud"

This is the real story behind all that industry denial:

"Big advertisers are pushing search engines behind the scenes to fight click fraud more aggressively, but many are afraid to criticize them publicly because they wield such clout. "Sixty percent of new customers come through Google. [Advertisers] can't afford to upset that channel, regardless of whether there's fraud," said Jason Clement, an associate director at Carat Fusion, a New York ad agency."

http://www.washingtonpost.com/wp-dyn/content/article/2006/10/21/AR2006102100936.html

Very interesting discussion on

http://battellemedia.com/archives/003003.php