http://www.identity20.com/media/OSCON2005/

From the page:
“As the online world moves towards Web 2.0, the concept of digital identity is evolving, and existing identity systems are falling behind.

New systems are emerging that place identity in the hands of users instead of directories. Simple, secure and open, these systems will provide the scalable, user-centric mechanism for authenticating and managing real-world identities online, enabling truly distinct and portable Internet identities.”

The presentation is a tour de force in how to use powerpoint. Both the content and style are brilliant.