There is an upcoming 2 part IIS Webcast on Delegation.

http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?EventID=1032267261&Culture=en-US 

MSDN Webcast: Getting Delegation to Work with IIS and ASP.NET: The Ins and Outs of Protocol Transition (Part 1 of 2) (Level 300)

http://msevents.microsoft.com/CUI/WebCastEventDetails.aspx?culture=en-US&EventID=1032267264&EventCategory=4

MSDN Webcast: Getting Delegation to Work with IIS and ASP.NET: Ins and Outs of Protocol Transition (Part 2 of 2) (Level 300) 

These should be pretty technical sessions on all the workings of ASP.NET and delegation. well worth checking out.