I'm well aware that readers of this blog can't all be interested in all of filmmaking, blogging technology, XML, pure mathematics, Eclipse, music, productivity software, RDF, Python and software development.
I've been planning on categories in Leonardo for a while and I'm pleased to say they'll come shortly after the current Leonardo rewrite.
I'm still thinking about the best way to approach them. My current thoughts are to merge the notion of a category being a feed that you post to with the notion of a category being a resource that you annotate. In other words, categorization equals feed-posting equals trackback.