Welcome to the RestDoc project! This project created a language-agnostic specification for self-describing REST API's that can be used to create powerful, re-usable tooling and client libraries.
Version 1.0 was just released on December 2nd, 2012 and can be found on http://www.restdoc.org.
Discussion and brainstorming for specification updates is happening on the wiki and issues of this project.
Another place is the Google group RestDoc https://groups.google.com/forum/#!forum/restdoc.
Please jump in and contribute your ideas and insights!