Yep. The RDF/XML data. I have a mirror of it on github: https://github.com/sethwoodworth/PG_rdf_metadata
I would love to have a complete python parser for the metadata. I strongly recommend collaborating with the Gutenberg package posted to HN a few weeks ago (and his rdf branch): https://github.com/c-w/Gutenberg/tree/migrate-to-rdf
GITenberg has a mailing list and would love to have you!