You Are Your Web Browser
The Electronic Frontier Foundation has been doing an experiment. Their initial hypothesis was that if you examine certain elements that a web browser provides to websites, you may be able to find combinations of such data that are unique. This is called a “browser fingerprint.” They have been testing this on their Panoptclick web site. [...]
http://blog.intego.com/2010/05/18/you-are-your-web-browser/