Protocol to access Portlet repositories

I recently come across this new project Portlet Repository Protocol(PRP). The project is about able to establish a standard way in which various Portal Administrators can search, download and deploy the portlets from Portlet Repository. This furthur stresses the need of a vendor indpendent Repository Source, where one can find many readily available portlets on various Portals. Here is the link if you want to know more about PRP