Via sweetcode, check out Rotisserie:
The Rotisserie implements an innovative approach to online discussion that encourages measured, thoughtful discourse in a way that traditional threaded messaging systems cannot.
The timing of the discussion is broken into semi-synchronous rounds. Users are allowed to post responses at any time, but their responses are not published to other users until the deadline for the current round passes. This structure allows users to put significant thought into their responses rather than competing with other participants to post first.
Sounds like Joel might be interested in this.
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