Panopticlick – How Unique and Trackable Is Your Browser Test
http://panopticlick.eff.org/

Is your browser configuration rare or unique? If so, web sites may be able to track you, even if you limit or disable cookies. 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. Only anonymous data will be collected by this site. A research project of the Electronic Frontier Foundation. This has been added to Privacy Resources Subject Tracer™ Information Blog.