I came across to WCF 4 routing features while designing some Central services which will provide various services to all of my client-end service. I like to create a single entry point to communicate all those service and keep them separate because of scalability reason. WCF routing feature seems to me very exciting which support for a configurable routing service that you can use in your WCF solutions. Provides features for content-based routing, protocol bridging, and error handling. But I have faced some issues there while defining their security context in Routing service environment.