Nick Carbone published this link on techrhet just yesterday:
I noticed a new posting this morning, explaining the site's purpose:
The Credibility Commons is an experimental environment enabling individuals the opportunity to try out different approaches to improving access to credible information on the World Wide Web. Tools will be provided to researchers as well as the public, allowing them to try out search strategies, collections and other approaches to improving access to credible information. The Commons can be viewed as a collaborative space in which to share ideas, data sets, results and innovations. This project is sponsored by the MacArthur Foundation who is deeply invested in improving access to credible information on the World Wide Web.