Dare Obasanjo, who's well smart (but with whom I usually disagree ;-) has taken over development of the BlogX weblog editor. He's already put together the RSS Bandit aggregator.
Thing about having both ends of the syndication system in front of you is that it's hard not to think about doing things with the stuff you're subscribed to, and republishing. (Subscribe-Process/Create-Republish). This is low-hanging fruitsville. Especially if you use Semantic Web technologies (but I doubt whether Dare will, at least not directly).
Anyhow, expect a flood.