Sitting in Stuart's Rendezvous session at foo camp, I was next to Sam Ruby, Jeremy Zawodny & Dave Sifry.
I said we need a Rendezvous way to find blog feeds - Dave said 'use OPML'.
So, the idea is to advertise local blog feeds via OPML, over Rendezvous.
Usage scenario: walk into a conference, open your Aggregator, and it shows you all the locally relevant feeds - bloggers attending the conference, a session time feed, local info feeds. You subscribe to the ones you find interesting.