Web Privacy
Opt-Out: Get Off the Lists!
Electronic Privacy Information Center
EPIC - Tools for Protecting Online Privacy
Buried in the Archive
DoubleClick - The Global Internet Advertising Solutions Company
One of the groups (to be polite) who enable tracking of your web session through the banners of pages you visit.
DoubleClick & Opt Out
Their notes on how to opt out of this.
Luckman Interactive Internet Software
Get "anonymous cookie": disables magic cookies