Edward,

One option might be <a href="http://omeka.org">Omeka</a> from the Center for
History and New Media (full disclosure, I work for CHNM). It's designed for
libraries, museums, archives, and like-minded folks to create online
exhibits of their materials, and so has lots of Dublin Core and other
metadata goodness (see the <a href="http://omeka.org/add-ons/plugins>plugins
page</a>). It's open source LAMP, and installation is pretty easy. There's
an OAI_PMH harvester plugin, and a CSV importer plugin. One of those would
likely do the trick for your importing.

Hope that helps,
Patrick