I have to say that I have been a fan of OpenID since our leadership in the development team (Luke and Ken) both turned me on to it. The concept is a fantastic advance and beside that I have long been a fan of a client side solution for identity management called Roboform.
The latest article on the O’Reillly site is very interesting in that it points to an even further advance using XFN to create what is called a social graph using XML. I really like this idea as social networks proliferate. One of my favorite applications that me and my CEO have taken a liking to on Facebook is the Interactive Friends Graph application. It allows you to dynamically see all your friends and your relationships and connections between them and you. I highly recommend it!
I am looking forward to seeing what more fun can come from OpenID and XFN.