Interesting Articles on Behavior Ads from Google

WHAT THEY ARE: http://www.marketingneophyte.com/blog/default.aspx?id=45&t=Behavioral-Advertising-and-the-Gazelle-D

Google Flicks Switch on AdWords User Behavior Filter?
http://www.marketingpilgrim.com/2007/06/google-flicks-switch-on-adwords-user-behavior-filter.htmlÂ