I love Tailrank and its little pictures of blogs as this page on the CardSpace OpenID Collaboration Announcement shows. I wonder how long the pages persist? I'll have to remember to come back and look at this link in a couple of months.
Meanwhile, I thought I would explore Tailrank further and got to the part where I had to sign in and said to myself, “No, I don't have time for that”.
Then it occured that this was just one more concrete example of a Web 2.0 opportunity going down the drain.
It seems so clear to me the Web 2.0 community should climb on board this user-centric identity thing ASAP.