Fortunately, Liberty Alliance and WS-* efforts and are starting to merge...

Here are the links:
- Web Single Sign-On Interoperability Profile defines an interoperability profile of the Web Single Sign-On Metadata Exchange Protocol that allows using either Liberty Identity Federation or WS-Federation-based Identity Providers to interact with a service.
- Web Single Sign-On Metadata Exchange Protocol defines how a service can query an identity provider for metadata that describes the identity-processing protocol suites supported by that provider.
- Microsoft PressPass announcement.
- Web Services Security Specifications Index page.

 

P.S. Did you know that Microsoft PressPass has also an RSS feed? Here.