If you are
interested in building identity-enabled web services there are two very
nice articles on the topic. The first one, from last October
is Federated Identity :
Single Sign-On Among Enterprises can be found here.
The latest in the series is Building Identity-Enabled Web
Services can be found here.
You can find more technical resources for Java Studio Enterprise here.
Incidentally I discovered a terrific UML-oriented series here.
If you missed it Java Studio Enterprise is now free.