Well the adage.com folks are also charging for info. And the "detailed" article at http://www.mediapost.com/publications/?fa=Articles.showArticle&art_aid=10888

Well the adage.com folks are also charging for info. And the "detailed" article at http://www.mediapost.com/publications/?fa=Articles.showArticle&art_aid=108887 http://www.mediapost.com/publications/?fa=Articles.showArtic... is short, but says: "Typically, marketers buy audiences and behavioral categories defined by publishers and ad networks. Quantcast, however, is offering them the opportunity to use their own data to define their target audience, and then to buy it directly in real-time." ...which doesn't say much to me.