I don't think this one's been forwarded to the list yet. It's a lot more "now" than the Aurora concept, and it clearly needs embedded metadata:
http://labs.mozilla.com/2008/08/introducing-ubiquity/ Of course, they mention "Microformats" in passing, but this is a lot like SearchMonkey in your browser: you really need to be able to add your own fields and trigger actions based on the data. Very cool prototype, -Ben