Finally discovered how to get metadata from DSpace-hosted items, such as the AMNH's Scientific Publications. They have an OAI interface, so that the URL http://digitallibrary.amnh.org/dspace-oai/request?
&identifier=oai:digitallibrary.amnh.org:2246/1999 will retrieve XML metadata for the record hdl:2246/1999 -- in this case, number 2578 of the American Museum novitates.
Oh, and the Simile project already has a OAI to RDF XSLT stylesheet (found courtesy of Leigh Dodds OAI bookmarks on del.icio.us).
Almost forgot, I stumbled across this information at Celestial.