Windows Communication Foundation 4 - ISBN 978-0-7356-4556-1 is one of the Microsoft Step-By-Step books. I will be studying this book over the comming weeks. What I have seen so far impresses me. One very practical item that more books of the type should have was the "Finding your best starting point".
There is one feature about this book that I hope Microsoft Press will provide on more books and that is to also provide the book electronically via Safari. Included in this is getting the book as a PDF!