Sent to a couple of lists:
I've made a start on putting together compatibility matrices from microformats etc. to format-independent models ('micromodels'). Ideally for each format there will be both an RDF/OWL schema/ontology for the domain, along with an XSLT mapping for format2rdfxml (to enable automatic translation via GRDDL).
The material's currently on the ESW Wiki, please edit as you see fit (sometime I'll probably move the stable stuff to static pages).