NUblog: Dubliners, where the Joe-man laments the slow adoption of RDF: “What we need is for Web pages to categorize themselves, which categorizations could then be computer-read and -collected. It’s already possible, but it ain’t happening.”
He’s missing the point: there is no incentive for me to try to understand RDF or add it to my website. Langauges like RSS or XFML adresses the incentive problem by adding value to a website with additional incoming and outgoing links. People can add metadata to other people’s sites (a core concept that makes topicmaps (and XFML) really powerful): not everyone has to be a librarian.
RDF is dead as a popular metadata format. If it was gonna happen, it would have already. Forget about it.