caveman - 9:38 pm on Apr 26, 2007 (gmt 0)

That is what I thought at first, when looking at the top of the doc, but upon reading it fully, it seems to be more about using regular ads on a site as another factor in site ranking, and assigning qualitative measures to the adverstisers based on traffic and other available info about the advertisers. That's my read anyway.

And that is only one small part of the full doc, even though it's the focus of the intro. A bit confusing in that respect. To me anyway.