http://drupal.org/node/499770



"The eXtensible Catalog (XC) project is working to design and develop a set of open-source applications that will provide libraries with an alternative way to reveal their collections to library users."

A description of the XC software is here: http://www.extensiblecatalog.org/node/310

Both the XC software and the Drupal modules are still under development, but they are going to have all: metadata management (even better: "an extensible metadata platform supporting multiple schemas that can be searched simultaneously to support FRBR-like functionality and navigation"!), Solr search, OAI provider, OAI harvester...)