Well, the tests for this are passing:
new WindowsCommunicationFoundation().Behaviors.Add( new RhinoMocks() )
That was tough, but I got it to work in a fashion that I like. This means WCF integration with Windsor, support for mocking WCF services on both ends of the wire and probably a couple other things that I am forgetting. I am in the middle of writing a blog post about it, and I had to stop when I got everything to work just right. That post is already 13 pages long, and I just had to post something as things were happening.