Tyler Cowen of Marginal Revolution has an interesting real-world analogue when he has to deal with q&a during his public speaking event. He believes that people are behaving in status-seeking ways and so forces people who want to ask questions to write them down and pass them up where he answers them anonymously[1]. Winer's 24-hour limit seems to be partially addressing this problem as well, but I agree with the comments already posted about that being too much time to care.

One possible solution I'm thinking about implementing in a new blog I'm starting is a separate Twitter comments account. This forces brevity and accountability among other things, and people could link to their own posts or places where my posts are (hopefully) being discussed. In addition, if the blog is successful, I could potentially see what comments are being retweeted, etc. and run some quick and dirty analytics to help determine high-value comments. Additional benefits would be connecting with high-value readers in a more intimate way that could improve dialogue as well as gently guide users to providing comments via email for longer dialogues. I'm concerned that 140 characters is too short to provide feedback, though the majority of comments I post on non-conversational sites seem to fit into that range.

Any thoughts?

[1] Sorry, I can't find a link to the article so I'm paraphrasing heavily.