The Microsoft Patterns and Practices team published a Service Factory Add-On recently, that enables the Service Factory to also create WCF services. Sorrily, just after the release of the Add-On, the .NET Team released .NET 3.0 RC1, which is not supported by the Add-On.
If you still wish to install it, you can install the Orca tool located in the bin/ directory of the Windows Vista SDK, open the Service Factory WCF installer package, and change the value of the LaunchCondition variable FRAMEWORK30 to the Version of RC1 (3.0.04324.17). Save it and then you can install it.
You can find more information at http://www.gotdotnet.com/codegallery/messageBoard/Thread.aspx?id=6fde9247-53a8-4879-853d-500cd2d97a83&mbid=fc07ebfb-4369-48e1-ab74-d6098ed220fe&threadid=99894479-0335-4a1b-bf91-bf771237cdfb.