Google announced they will begin requiring many of their advertisers to ensure their web site practices and technology is in accordance with rules to make the AdWords marketplace "safe, fair, and trusted marketplace" for their searches.
These three new requirements go into effect May 17, 2011.
A WebmasterWorld thread is very skeptical that these new policies will prevent shady advertisers from advertising on Google and scamming Google's searchers and users. One advertiser said:
Either way, requiring SSL means nothing at this point, SSL certificates can be acquired for peanuts or even free. They should have been more specific about the type of the SSL certificate.
Forum discussion at WebmasterWorld.