We (Steve, Chris, and I) can finally say that Essential Windows Communication Foundation will be available soon. It took almost two years to complete (yes, a very long time). One major takeaway from the experience "Writing a book is extremely hard work." I personally spent many days and nights at Starbucks in many different cities (Austin, Acton, Concord, Westford, New York, Seattle, Redmond, and many more) writing the book. It was a great way to focus on the task at hand. After all the time spent, we are happy that you will soon be able to get the book. It is already available for pre-order on Amazon.
We are happy to be releasing it and think it will help many people write great WCF applications using both .NET 3.0 and .NET 3.5.