Microsoft released a community focused meta-data driven service repository, the Managed Services Engine (MSE) on Codeplex, Microsoft's open source project hosting site.
The Maaged Services Engine embodies an approach developed by Microsoft Services for their enterprise SOA customers.
The current 6.2 version - released as a Community Technology Preview - makes virtualization of both WCF and regular WSDL services possible and comes with a 30 minutes walkthrough.