Claims-Aware ASP.NET Service Using ACS

How To: Create My First Claims-Aware ASP.NET Service Using ACS
http://msdn.microsoft.com/en-us/library/gg429785.aspx

http://msdn.microsoft.com/en-us/library/ee748481.aspx

Building a claims aware WCF Service using Windows Identity Foundation
http://blogs.profitbase.com/tsenn/?p=31