Yesterday I was helping somebody with a small WCF application and one of the tools I proposed was a plugin visualizer for Visual Studio called WCF Visualizers. It's available freely on CodePlex and will allow you to see different parts of WCF (messages, endpoints, channels...) while you are debugging. Go and check it out, as there are some great images on the project page. The next time I give a WCF presentation with Francois at different user groups, I will also take the time demo this tool.