Except for Ping identity package for .NET (where they used the xsd generated classes) for Liberty & SAML specifications I do not see single .NET implementation of either specifications. I am surprised why ASP.NET community and companies who use ASP/ASP.NET are not concerened about these standards or may be they are waiting for Microsoft to provide WS-Federation support.
I am in the process of writting SAML 2.0 implementation in C# and will open source it once I have a working version. I am using WSE 2.0 frameworks for the implementation.