Keith Brown writes on "InfoCard"
As if David Chappell's "InfoCard" paper wasn't enough, the inimitable Keith Brown, security guru to the stars has also published a couple of "InfoCard" articles in MSDN Magazine which are now available online. The first article outlines "InfoCard" and the Identity Metasystem. The second delves in more depth into how "InfoCard" works and how to use it.
Enjoy! :)