RIA Services is open sourced now!
check out Jeff's announcement at http://jeffhandley.com/archive/2013/07/03/ria-services-is-getting-open-sourced.aspx!
The project site is http://www.openriaservices.net/, with Colin Blair as the project lead.
The source code is at https://openriaservices.codeplex.com/.
I am happy to see this as one of the original members of the RIA Service team!