EDRA is an Enterprise Development Reference Architecture for Services Oriented Applications build with .Net. The project was formerly know as ShadowFax.
The project website is at http://practices.gotdotnet.com/workspace.aspx?id=9c29a963-594e-4e7a-9c45-576198df8058.
I would say this is a must read for anyone who is involved in developing applications with a services oriented architecture.