I highly recommend the new book Understanding Windows CardSpace: An Introduction to the Concepts and Challenges of Digital Identities by Vittorio Bertocci, Garrett Serack, and Caleb Baker. As I wrote for the “praise page” of the book after reading the current draft:
Chock full of useful, actionable information covering the “whys”, “whats”, and “hows” of employing safer, easier-to-use, privacy-preserving digital identities. Insightful perspectives, on topics from cryptography and protocols to user interfaces and online threats to businesses drivers, make this an essential resource!
A must-have for anyone deploying or considering deploying Information Cards. And if you can’t wait for the book to be published, you can also purchase a first draft of the book from Rough Cuts. Enjoy!