Ever since Aurora (screenshots) was first mentioned the idea of data being able to render itself or "Wonder GUI" has been thrown around in various forms (Haystack's Ozone, Microcontent or Topicalla).
I've been looking, again, at XBL and RDF Datasources in Mozilla. Especially, the way in which Kowari's Descriptors will interact with it, especially given all of the widgets available. The RDF datasources maybe URLs and using something like Joseki's WebAPI to query the database or generate XUL dynamically.
Jon Udell's recent piece on Why Mozilla matters also reinforces this: "But as Web services redefine documents, Mozilla, an open and extensible document-handling engine, looks more strategic than ever."