I have had the honor of working with the Patterns & Practices Team on a set of design patterns around providing secure service communications. My involvement has been somewhere between casual observer and boat anchor but it has been great watching these patterns and documents evolve. Now the workspace on GotDotNet is open to the public so anybody can download, review, and comment on the patterns and guidance they provide. If you interested in learning more about implementing security with web services, WSE, and x.509 this is a great resource. The documents are also available as a CHM file.
Congrats to Tom Hollander and the rest of the team on a job very well done. Visit Service Orientation Patterns on Patterns.GotDotNet.com.