Ahh, I'm a day late and a dollar short. Yesterday the PAG Team announced Service BAT - Service Baseline Architecture Toolkit - that will guide and help you implement WCF and ASMX services. They have had a bunch of plumbers helping them out including Christian Weyer and Pablo Cibraro. I can't wait to get my hands on it. This type of tooling will help take another layer of fear (and unintentional bad design) allowing WCF to be accessible to a lot more people.

Here's Jason Blogg's announcement.

Edward Bakker has some good details.