Juval Lowy (of
IDesign) has added a free code library for WCF development, which includes demos covering WCF essentials, contract design, data contracts, operations and calls, instance management, faults, transactions, concurrency management, queued calls and security. The downloads shed light on poorly-documented and understood aspects, demonstrate relevant design guidelines, best practices, and pitfalls. The demos are also used during their
WCF Master Class to demystify technical points, as lab exercises or to answer questions. You can find the code library
here.
I remember looking at some of the demos and sample code from IDesign when I was doing some development in WCF a few months ago. The staff of IDesign were very helpful in answering some tough WCF security questions. If you have a chance, sign up for one of the Master classes -- the one in June is sold out but there is another one in August. I am thinking about taking that one myself.