Curt Siffert writes about something I echo:
I want meta-conversations that we can redirect to our blogs on demand. When I write a post that is topical in some way, I want to ping a conversation about that topic. (We’ve got topicexchange, but that isn’t a collection of conversations; it’s a collection of blog entries designed to elicit conversation.) The conversation is going on before I ping to it, and after. But when my blog entry pings the conversation, that ping would be considered part of the conversation. Everyone participating in the conversation would see that ping and be able to read my blog entry. And then the best part of it would be that any further conversation following up to that ping would automatically be showing on the comments section of my blog entry.
What does that mean? It means that you don’t necessarily have to be reading my weblog in order to post a comment to it. It also means that people who read that entry out of my built-in-audience can find my weblog entry and the discussion it inspires just by reading my weblog; and commenting on it will be also sent to the meta-conversation and read by a much wider audience of people.