Do you use web services?  If you have concerns about interoperability and security, then you probably would like to see SAML support on .NET.  Well here's something for you.  The Patterns&Practices team at Microsoft have just released a SAML sample that works with .NET 2.0 and WSE 3.0.  They call it the SAML STS for WSE3.0 Quickstart

http://practices.gotdotnet.com/projects/saml

For those of you who don't have English as a first language, don't worry, your eyes are not deceiving you.  Yes, that name is just a bunch of vaguely-related nouns with one pronoun stuck in the middle for good luck.  So forget the name, and listen to what I say:  It is a sample, with source code, for a security token service that supports issuance of SAML v1.1 tokens.

If your answer to that is "Huh?", then check this picture:

Props to Don Smith, and Jason Hogg.