Let's not get started on those who implement that poorly.

I was signing up for a site that took openid the other day- and then after confirming access - I was returned to the site. There, I was prompted for email, first/last name, and 2x password to use on the site, in order to complete my registration. (This email and password would be my future login.)

Nothing quite like implementing a buzzword while missing the point completely...

OpenID is not quite good enough.

Persona on the other hand is what you want, long term. Mozilla did everything right.

That is, everything except marketing it properly. And abandoning it... sigh.