Last week from PDC 2009 comes the identity developer training kit... http://www.microsoft.com/downloads/details.aspx?familyid=C3E315FA-94E2-4028-99CB-904369F177C0&displaylang=en You could find interesting this resources as well : WIF SDK and this...
The release of Windows Identity foundation come to light ,it's a framework to help developing claim based authentication without developer headache Look at this post of the geneva team blog... it sounds really good Time to experiment....one more time...