This was a big thread over the weekend and I didn't really read it until now.
All ads on ATP are served via Google.
Yes, Google tracks your usage around the web and they tailor the ads you see (here and elsewhere) to things that they hope are relevant to you.
Last year I was shopping for a new cell phone for Trish and after doing some searches, I started seeing Verizon ads on ATP.
Nobody sees the same ads, although some ads are not targeted to the individual but rather are targeted to the audience. Ads like gardening companies will appear on ATP because ATP is a gardening site. In those cases, we all see them. Sometimes junk ads like that mail ad people were talking about earlier, appear on every site across Google's ad network.
