Create a connector to a service that supports the Content Management Interoperability Services standard (CMIS), allowing a ModeShape JCR instance to access the content, metadata, and other information from a CMIS system. CMIS implementations are starting to appear, including Apache Chemistry's CMIS implementation, Nuxeo's CMIS demo at http://cmis.demo.nuxeo.org/nuxeo/site/cmis/repository and with Alfresco's CMIS Repository at http://cmis.alfresco.com/service/cmis.
CMIS types should map pretty cleanly to JCR types. Also, the CMIS query language should also map pretty well, allowing the connector to implement search by delegating to CMIS.
Implementing this sooner would help us gain some traction in the CMIS space.