I have been working with ADFS claims more and more at work, habitually trying to bridge some of the gaps natively built in between the ADFS and MOSS platform (noticeably visible when working with MOSS specific user and security features like Profiles
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Read the complete post at http://www.sharepointsecurity.com/blog/sharepoint/sharepoint-2007-development/testing-whether-adfs-user-is-authenticated/