Danny Ayers has updated the RDF Review Vocabulary with a handful of new terms (suggested by ITerating and Revyu, two entities currently deploying this vocabulary), and also made it OWL DL-friendly. He's also set it up as a GRDDL-enabled HTML meta data profile for the hReview microformat. He says still has some debugging to do, and wants to put together a diagram showing the classes and properties.

The Review Vocabulary was created for the purpose of creating sharable reviews and ratings of blogs, podcasts, music, books, software, (i.e. anything identifiable). The vocabulary is suitable for use in any RDF-compatible language: FOAF, DOAP, RSS etc. It is also compatible with the hReview microformat.