As promised, here are the sources from my NTK 2008 sessions .
Talk: Document Style Service Interfaces
Read the following blog entry, I tried to describe the concept in detail. Also, this blog post discusses issues when using large document parameters with reliable transport (WS-RM) channels.
Demo: Document Style Service Interfaces [Download]
This demo defines a service interface with the document parameter model, ie. Guid CreatePerson(XmlDocument person). It shows three different approaches to creation of the passed document:
- Raw XML creation
- XML Serialization of the (attribute annotated) object graph
- XML Serialization using the client object model
Also, versioned schemas for the Person document are shown, including the support for document validation and version independence.
Talk: Windows Server 2008 and Transactional NTFS
This blog entry describes the concept.
Demo 1: Logging using CLFS (Common Log File System) [Download]
Demo 2: NTFS Transactions using the File System, SQL, WCF [Download]
Demo 3: NTFS Transactions using the WCF, MTOM Transport [Download] 
 All sources are in VS 2008 solution file format.
 This transaction spans from the client, through the service boundary, to the server.