Not sure if this has been discussed here before, but I was searching for some specialty items in Google. Minutes later, I went to my site to respond to a post, and the ads being served were for the products I had been searching for just minutes prior. That's a pretty good algorithm right there! I hope it works that way every time somebody visits my sites. Anyone know any more specifics on this? Edit: I did find more on this..... http://www.pandia.com/sew/1439-google-to-use-cookies-to-pesonalize-ads.html From 2009. Now I recall reading it somewhere, but had never seen it actually happen to me in such real-time before.