I'm a big fan of using service virtualization to solve a variety of problems with developing and managing web services. The Managed Services Engine is a solution built on top of WCF to supply a repository-based runtime and management tool for service virtualization. I hope to someday put the solutions team out of business by making service virtualization easier to do in the product. For now though, the Managed Services Engine is one of the better web service virtualization systems that I've seen. You can get their new June CTP on CodePlex , which replaces the previous beta release from last October. Read More...