Windows Communication Foundation

Windows Communication Foundation
.Net 3.5 http://msdn.microsoft.com/en-us/library/ms735119.aspx

.Net 4.0 http://msdn.microsoft.com/en-us/library/dd456779.aspx

Getting Started Tutorial
http://msdn.microsoft.com/en-us/library/ms734712.aspx

What Is Windows Communication Foundation
http://msdn.microsoft.com/en-us/library/ms731082.aspx

WCF Samples
http://msdn.microsoft.com/en-us/library/ms730936.aspx