Written by Aaron Skonnard, this was originally named "Integrating Microsoft BizTalk Server 2006 R2 with the Windows Communication Foundation". It has been renamed to "Using the Windows Communication Foundation (WCF) Adapters in Biztalk Server". It can be found on MSDN at http://msdn.microsoft.com/en-us/library/bb967002.aspx, or directly from the download center at http://www.microsoft.com/downloads/details.aspx?familyid=a976dc7d-2296-4f88-be4d-0d314fca9e59&displaylang=en&tm.
Here are the first few paragraphs from the paper giving a brief introduction of it's content.
Microsoft® BizTalk® Server has long supported Web services as a primary communication technique but the support has been fairly limited to date. For example, developers working with BizTalk Server 2006 can use the built-in SOAP adapter to achieve “basic profile” service integration or the downloadable Web Services Enhancements (WSE) 2.0 adapter when support for the various WS-Security specifications is required. But that’s as far as these existing adapters can take you in today’s maturing service-oriented landscape. Developers working in more modern service-oriented environments, which build on the various WS-* protocols, have been unable to fully utilize BizTalk Server 2006 in such environments since the product lacked support for Windows® Communication Foundation (WCF) within the messaging layer.
Fortunately, with the release of BizTalk Server 2006 R2, developers will find a set of new WCF adapters that offer full integration with the advanced WS-* specifications supported by the WCF runtime. These adapters target the most common WCF communication scenarios and make them easy to tackle. As with the earlier SOAP/WSE adapters, developers can use the tools provided with the WCF adapters to publish WCF services from orchestrations or schemas and to consume external services using a variety of different transport, encoding, and protocol options, offering unparalleled service-oriented flexibility. The remainder of this white paper provides in-depth coverage on using the new WCF adapters.