Mark Bernstein writes about how weblogs are emergent hypertexts, each new entry adding a piece to an ongoing story, all interconnected.
He also mentions how the separate posts when put together are something more. I how when I used to have long-running email conversations with people, I didn’t remember the individual messages — they were simply notices to update shared state — instead, I remembered the conversation as one long flowing whole with banter moving back and forth with no delay. Even though emails often had many threads going along in the same message, my mind compressed these into one coversation.
I expect that a similar thing will happen with blog conversations. What we remember will not be what is said, but what is created by all of us when we say it.