HTTP Programming with WCF and the .NET Framework 3.5

"WCF in the .NET Framework 3.5 builds on the extensibility points in the .NET Framework 3.0 to include first-class support for building services that adhere to the principles of the Web. This includes an easy-to-use HTTP programming model, JavaScript Object Notation (JSON) messaging capabilities, and a new syndication API that makes it easy to create and consume syndicated content."