For example, many people are familiar with the browser's user string; mine is "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:8.0.1) Gecko/20100101 Firefox/8.0.1". This isn't, however, the only information that gets passed along:
Based on this information, "Your browser fingerprint appears to be unique among the 1,881,909 tested so far.
Currently, we estimate that your browser has a fingerprint that conveys at least 20.84 bits of identifying information."
What does this mean for everyone else?