Could you imagine LiveJournal with a 24 or 48 hour lag between each comment? Conversations would grind by slowly. The ability to comment on a topic of interest and refine that down to a very specific point or points in minutes is a beautiful form of communication, one that I miss terribly when I read the newspaper reader opinion page. Sometimes I reach for a Reply to this link in vain ;)
Newspapers out of date
What blogs are the professionals using?