To get single sign on in the Cloud Microsoft offers Windows Indentity Framework (WIF)  a new addition to the .NET Technologies Stack formerly known as Geneva Framework. WIF is now available as a Release Candidate from MSDN Eval Center together with it’s server part Active Directory Federation Service V2.0 which offers a secure Web-Service for AD as an end-point to Cloud Apps according to WS-Federation and SAML Protocols.

If you want single sign on in the cloud that is what you need

http://code.msdn.microsoft.com/wifwazpassive

http://msdn.microsoft.com/de-de/evalcenter/dd440951(en-us).aspx

http://technet.microsoft.com/de-de/evalcenter/ee476597(en-us).aspx

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