It might be interesting to implement parliamentary procedure for certain specific debates, but to do so for all debates (whether on CD or otherwise) would become cumbersome quickly and would stifle the free, spontaneous expression of thought that CD's current format allows. For things like the town halls that occasionally crop up I think that a more structured discussion would be not only helpful but perhaps even necessary. Still, the diverse population of the Internet makes a more structured debate difficult, timezones must be synchronized, rules clearly and thoroughly disseminated and most importantly active and respected moderators found and trained.