Who’s watching you on line
Track the trackers. If you use Firefox you might like to try their add on called Collusion.
Collusion is an experimental add-on for Firefox and allows you to see all the third parties that are tracking your movements across the Web. It will show, in real time, how that data creates a spider-web of interaction between companies and other trackers.
It really is quite startling to see, in a cloud type format, who has linked to you with a cookie.