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This is about 6 months old (so you may have already seen it), but when doing research for the DataPortability Project Timeline, I found this very clear and concise overview of OpenID:

There’s nothing earth-shattering here, but in case you’ve been scratching your head about OpenID (especially with all the recent news), this might help. And my guess is that even if you know all this, you probably know some folks who could use the primer.

Enjoy.