What about WCF in .NET 4? How does it work with Windows Workflow Foundation?
In the .NET Framework 4, there have been significant enhancements in the Windows Communication Foundation (WCF) and Windows Workflow Foundation (WF) namespaces. .NET developers can use these technologies, either independently or together, to eliminate the tradeoff between ease of service authoring and performant, scalable services. Read more about WCF and WF in .NET 4.