I've clicked around on the AdWords links recently, and in the past day or so I've noticed that when you backtrack to the Google search page, it asks if the link was useful or not. I'd hazard a guess that this is part of Google's algorithm for weeding out bad sites (i.e. MFA/4Best type sites).
The great thing is now we can DO SOMETHING about the sites. If it's a MFA spam page, just go back and click on the "no" button when Google asks if it was useful. Seems like one click can help get rid of those annoying, nigh-useless sites.
So get clicking!
Edit: [webmasterworld.com...]
[edited by: BriGuy20 at 2:59 am (utc) on July 16, 2006]