On the advice of my AdSense optimization specialist, I enabled the setting in Google AdSense that prevents my ads from showing up on sites that I haven't authorized. This is evidentally important because your account can be revoked if the ads show up on sites that don't conform to Google's AdSense Policies.
One big downside to this is that there is a list of about 80 third party sites that show my ads. Most of them are sites that cache my content in some form. Now when I log into my AdSense account Google shows the message:
We've noticed your ad code has appeared on websites you haven't authorized. To avoid lost revenue, make sure to authorize any sites you own to display ads by visiting your account settings.
Is there any way to make this message disappear other than authorizing these sites? This alert is getting on my nerves. I haven't been able to find a black list equivelant of Google's authorized sites white list.