We’ve been helping with the development of the PRISMS resource review utility and public interface.
Our most recent task was to find a way to provide access to the data in an exchange format compatible with the NSDL. To do this we were looking for a PHP-based OAI provider that could interface with our MySQL database. We found a capable application in the work of Heinrich Stamerjohanns. He has put together a set of PHP scripts which provides exactly the kind of functionality we needed.