Web 2.0 and Semantic Web: The Impact on Scientific Publishing, probably the densest panel I attended today (and again expertly moderated by Science Commons’ John Wilbanks), covered open access, new business models for scientific publishers, and how web technologies can help with these and data problems, but kept coming back to how officious Semantic Web technologies and controlled ontologies (which are not the same at all, but are often lumped together) and microformats and tagging (also distinct) complement each other (all four of ‘em!), even within a single application. I agree.
Nearly on point, this comment elsewhere by Denny Vrandecic of the Semantic MediaWiki project:
You are supposed to change the vocabulary in a wiki-way, just as well as the data itself. Need a new relation? Invent it. Figured out it’s wrong? Rename. Want a new category of things? Make it.