Seems everyday that their is a new article on on Google Adsense Policy, a new article out today calls into question some of the advertisers that are clearly abusing the system. Personally I have been battling companies targeting this site as well.
With the thousands of companies advertising on Google I cannot even imagine the administrative nightmare it is to keep up with all the scammers out there. But the linked article tells a telling tale of some of the issues that Google is facing. [www.benedelman.org]