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...

Technorati Tags: documentation identity OpenID