Paul’s done a post about his writeup of password cards on the Higgins wiki. IMHO this is a long overdue idea for how an identity client (“selector” in information card terms) can overcome the chicken-and-egg adoption problem.
Selectors are like browsers – the more of them people start using, the more sites become card-enabled. It won’t work the other way around. So the trick is issuing i-cards that provide real end-user value before sites start issuing them for login, cross-domain claims transfer, etc.
More about that soon.