Online tracking has become big business.  The FTC is proposing a way to control it that would be analogous to the Do Not Call registry.
http://news.yahoo.com/s/ap/20101201/...c_do_not_track
"WASHINGTON – Federal regulators are proposing to create a "Do Not  Track" tool for the Internet so that consumers could prevent marketers  from tracking their Web browsing habits and other behavior in order to  target advertising.
                 "The proposal, inspired by the government's existing  "Do Not Call" registry for telemarketers, is among the recommendations  outlined in a privacy report released Wednesday by the Federal Trade  Commission. The report lays out a broad framework for protecting  consumer privacy both online and offline as personal data collection  becomes ubiquitous — often without consumer knowledge.
Another good link is: 
http://ftc.gov/opa/2010/12/privacyreport.shtm
		
		
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