Panopticlick
"Panopticlick tests your browser to see how unique it is based on the information it will share with sites it visits. Click below and you will be given a uniqueness score, letting you see how easily identifiable you might be as you surf the web."
Preventing paranoia: when does Google Chrome talk to Google.com?
Advertising and Privacy – Google Privacy Center
opt out of (some of?) google's ad tracking cookies
New Feature: Sharing with Friends -
Radiant Core: Blog: Deconstructing Facebook Beacon JavaScript
Guardian Unlimited | Special reports | How DNA may tell police the surname of the criminal
CASPIAN Consumers Against Supermarket Privacy Invasion And Numbering
What the Internet knows about you
using the :visited selector to figure out what site a user has visited
Art Fag City » IMG MGMT: The Nine Eyes of Google Street View
reflections on google street view
The weirdness of crowds
"... when I wrote the privacy statement for the thing I said I wouldn't use the IP addresses, because I thought people might be freaked by the data gathering aspect. Now, it turns out that only two people bothered to read the privacy policy, so I could ha