I just released a new project on CodePlex called SimpleWcf"
SimpleWcf provides a way to essentially do “simple, configuration-less, file-less, WCF 4.0”. It works by discovering services using reflection and assumes a convention is intended for the namespaces.
It leverages a lot of the great new baked in defaults in WCF 4.0.
http://simplewcf.codeplex.com/documentation