BusinessWeek has written an interesting article about New York’s lawsuit against Direct Revenue. They have examined court documents and interviewed some people.
Even though pop-up ads maybe is not the greatest threat against safe computing, I think this is an interesting reading to understand how these people work (or do not work).
Oh, and yes, people really didn’t like to have their computers filled with ads. There are some examples of complaints, but bad words are censored, so I think it will be OK to link.