Tracking cookies

F-Secure has a good write up on tracking cookies. Ed Bott tells how to eliminate them. The only problem with this method is the rare occasion when an action on a website requires a third-party cookie. (Logging into WordPress seems to do so.) I've looked at a couple of Firefox extension that block tracking cookies while still allowing third-party cookies. They are Ghostery and the Easy Privacy list for Adblock Plus. Both seem to work well.