After Spybot warned me for about the 50th time that someone wanted to put spyware from 'Avenue A' on my system, I decided to look them up. It doesn't get much more blatant than this, and that fact that is commercially accepted makes it worse. These are the guys responsible for all those spyware cookies and spam you get. They even say so. Look at this page...
http://www.avenuea.com/services/
Site specific behavioral analysis?
Purchased and House e-mail lists?
Yup, no doubt about it. These are one of the schmucks responsible for my getting anywhere from 20 to 30 spam messages per day. Thank God for filters... ::)