Courtesy of Lambda the Ultimate is this link: "Explaining why we use RDF instead of just XML". In the whole ongoing RDF/RSS 1.0 versus RSS 2 debate, I'm finding myself ever more on the RSS/RDF side. Part of it is the politics. But a greater part of it is that RSS 2 seems to be trying hard to be a weblog format. And weblogs are not the only kind of data out there on the internet. (Although, since most webloggers seem to be stuck writing about weblogs, webloggers, and so on, it's not surprising that they might think that a weblog is the only thing worth doing on the internet anymore).
To see an interesting application of RDF for editing purposes (take that, Echo!), look at Moztop:
Moztop is a site development environment for Zope. It is written in Mozilla and aimed at people who think Dreamweaver UltraDev is a good tool.(Except that I don't think UltraDev is a good tool, but that's just me. It's been years since I've gotten along well with the User Interface of a Macromedia product). In any case, RDF is used to send descriptions of the data and site structure to the Moztop client, and XML-RPC is used in many cases to save data back to the server. (XML-RPC in Zope 3 is easy. It's fairly easy in Zope 2 as well, but Zope 2 is much closer to the dream of what XML-RPC should and could be, but isn't, for better or worse. I've written on this before, but don't really care to revisit it now).