Bruce Schneier brings this to our attention at his blog.
My results:
"Your browser fingerprint appears to be unique among the 430,332 tested so far.
Currently, we estimate that your browser has a fingerprint that conveys at least 18.72 bits of identifying information."
Tracking your Browser Without Cookies
How unique is your browser? Can you be tracked simply by its characteristics? The EFF is trying to find out. Their site Panopticlick will measure the characteristics of your browser setup and tell you how unique it is.
I just ran the test on myself, and my browser is unique amongst the 120,000 browsers tested so far. It's my browser plugin details; no one else has the exact configuration I do. My list of system fonts is almost unique; only one other person has the exact configuration I do. (This seems odd to me, I have a week old Sony laptop running Windows 7, and I haven't done anything with the fonts.)
EFF has some suggestions for self-defense, none of them very satisfactory. And here's a news story.
EDITED TO ADD (1/29): There's a lot in the comments leading me to question the accuracy of this test. I'll post more when I know more.
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