If you want to understand ASFSv2 a little more then this would be a good session to attend delivered by the Oxford Computer Group:

Webinar - Federation with Microsoft AD FS 2.0

Thursday 7th of July 2011 11:00:00 AM
A 30 minute webinar on Federated Identity and Microsoft Active Directory Federation Services 2.0...
More information

Further recording and resources from OCG and Office 365 are below:

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