From the Mind of Trevor Stone

With Panopticlick, the EFF is pointing out how websites could track you even if you don't have cookies enabled. If JavaScript is enabled, website authors can figure out things like your set of plugins and fonts. But when I visited with NoScript enabled, my browser fingerprint was unique among the first 425,722 seen. I guess of the 35 visitors running Firefox 3.6 on MacOS X 10.6, I'm the only one with JavaScript disabled. Heck, I even had one collision using lynx!

Unlike super market loyalty cards, it's a lot harder to trade web browsers with a stranger to throw the trackers for a loop.