Panopticlick
Your browser fingerprint appears to be unique among the 534,354 tested so far.
Currently, we estimate that your browser has a fingerprint that conveys at least 19.03 bits of identifying information.
The measurements we used to obtain this result are listed below. You can read more about the methodology here, and about some defenses against fingerprinting here.
Visualization end explanation of how OpenID works:
The articles are rather old but well worth the read to get the general gist of what is going on when you want to use and understand OpenID.
Part 1:
http://enthusiasm.cozy.org/archives/2005/05/openid
Part 2:
http://enthusiasm.cozy.org/archives/2005/05/openid-part-ii
Part3 and flowchart:
http://enthusiasm.cozy.org/archives/2005/05/openid-part-iii-pingpong
Part 4:
http://enthusiasm.cozy.org/archives/2005/05/openid-part-iv-url-as-global...