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 service tests your browser to see how unique it is based on the information it will share with sites it visits. The service will show the information your web browser tells to web sites and how unique your setup is.
Is Every Browser Unique? Results Fom The Panopticlick Experiment
How Unique Is Your Web Browser?
Panopticlick: Your Web browsing is less anonymous than you think
A Primer on Information Theory and Privacy