Also, if you've been waiting for Persona to hit "beta" before trying it out, well, check back Thursday morning. :)
For example, you could define a special URLs for login and logout actions. (E.g. persona:action=login&onsuccess=encoded_url1&onfailure=encodedurl2 ). I don't know about others, but it would make me much more willing to give a try.
Realistically, I expect most people/services will converge on Single Sign On via one of Twitter, Google, Facebook, and maybe a couple others. Hopefully all offering 2-factor authentication. So you'll only need a handful of passwords anyway.
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