Windows Communication Foundation (WCF) Improvements for .NET 3.5 SP1

Servicepack 1 for the .NET Framework 3.5 is coming out so there are many new features and improvements… like this list of WCF Improvements:

New Hosting Wizard for WCF Service projects.
Enhancements in Test Client such as support for RM Sessions, Message Contract and Nullable types enables testing of broader set of WCF-based services.
Expanding reach of DataContract Serializer by relaxing the need of having [DataContract]/ [DataMember] on types and by supporting an interoperable mechanism for dealing with object references.
Improved Partial Trust Debugging Experience with support for Event Log.
Support for ADO.NET Entity Framework entities in WCF contracts.
Improvements in writing REST based services ranging from easily supporting ServiceDocuments publication and consumption to providing greater control and usability of UriTemplate.
Significant performance improvements on large workflow-based projects in Visual Studio.
Considerable scalability increases for hosted WCF services in IIS7-integrated mode.