Ben Edelman has released a preliminary report on Gator, which monitors users’ visits and provides targeted pop-up advertising.  Ben has devised a method for discerning which third-parties may be using Gator to target a particular website.  Ben describes his report as follows:

“I today released “Documentation of Gator Advertisements and Targeting,” a report that describes my methodology and findings, including more than seven thousand speciic web sites targeted by Gator.  My report also offers users a web form for testing whether Gator targets specified sites, and if it does, viewing the speciic ads Gator shows.”

I have used Ben’s services on behalf of a client and his test appears to do what he says it does.