About wif experiment
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 whitpaper about WIF for developer
Finally look at this post of geneva team blog giving some suggestion about WCF - WIF interaction scenarios : http://blogs.msdn.com/card/archive/2009/11/19/using-wif-on-a-wcf-client.aspx
Geneva, I'm coming 