OpenGeoportal.org is a new site that brings together geospatial professionals, developers, metadata specialists, and librarians to coordinate the Open Geoportal (OGP) project. The Open Geoportal is a collaboratively developed, open source, federated web application to rapidly discover, preview, and retrieve geospatial data from multiple repositories. OpenGeoportal.org is also a collaborative effort to share resources and best practices in the areas of application development, metadata, data sharing, data licensing, and data sources in support of geospatial data repositories. Please contact Patrick.Florance@Tufts.edu for more information. The Open Geoportal is now receiving additional support from the Alfred P. Sloan Foundation.
A cloud instance of Open Geoportal 2.0 can be found 
here.
The project’s code repository is hosted on github. Documentation can be found here. However, some technical documentation is still on the old google code site: technical documentation/wiki.