By way of Don Smith.  Details:

http://blogs.msdn.com/donsmith/archive/2007/01/09/come-and-get-yer-service-factory.aspx

The two features that jumped out at me are support for the Windows Communication Foundation (WCF) and "WSDL-first support."  The direct download is here.

UPDATE: Here are two really good MSDN articles on the Service Factory from Aaron Skonnard:

Web Service Software Factory http://msdn.microsoft.com/msdnmag/issues/06/12/ServiceStation/

The Service Factory for WCF http://msdn.microsoft.com/msdnmag/issues/07/02/ServiceStation/default.aspx

-Marc