It seems micro-blogging / tweetering (is that the right word?) are gaining momentum lately. With the announcement of the Friendfeed Comet API, I think we're moving closer and closer to Comet-driven content delivery.
But to be honest, I think we've already reached a point of critical communication speed. It easy enough to just hit the refresh button to check if anyone anywhere said anything new.
Also, no advertising system that I know of works well to generate eyeball revenue for sites that don't get page refreshes (and I think the ads-in-videos stuff they're trying on Youtube is pretty lame).
With that in mind, I think it's safe to say that value and agenda payloads will more than ever become tied to content: all hail the mass self-aggrandizing propaganda that looms.
The challenge, hence, is to create connection channels that can maximize selectivity and specificity. Maybe tagging actual content and categorizing/prioritizing based on bayesian filtering?