Re: Single login?
A possible issue with the idea of using a different password for each website is, that if your email gets broken into, most websites will allow a password reset, so the baddies will get access to all of them anyway. In effect you have the same single point of failure as you do with persona.
Unless of course you have a different email account for each website....
But what happens if you reset them email account passwords.... ahhhh pop.
Non-password authentication will always win security wise for a number of reasons, so now I just have to wait for el reg to get sorted with it :)