Vibro.NET : Credentials vs. Identity; Authentication vs.... what?

The identity problem is an interesting one.  Lots happening in this space -- not just on the Microsoft front.  If you are interested, be sure to follow the announcements that will come out of the Catalyst conference in NorCal this week. 

With such a lively discussion, what could make it better?  Yet another wonderful post by our own Vittorio Bertocci and this one with charming illustrations as well.