The Panoptoclick project tests the uniqueness of your browser configuration based on this methodology. I found it pretty interesting, as occasionally people want to know how you can be identified (or how someone identifies you) online.
Doh.
Your browser fingerprint appears to be unique among the 153,963 tested so far.
Currently, we estimate that your browser has a fingerprint that conveys at least 17.23 bits of identifying information.
Doh.