This fell through the cracks over the summer holiday time:
The 2nd edition of the Patterns & Practices “claims guide” has been released. This is excellent!
We added a lot of content around ADFS, Access Control Service, REST and SharePoint. All source code is available as well!
Grab it from: http://msdn.microsoft.com/en-us/library/ff423674.aspx
Or use my vanity URL: http://tinyurl.com/claimsguide