<a href="http://nielsenhayden.com/makinglight" rel="nofollow">http://nielsenhayden.com/makinglight</a> (Making Light) is routinely in the 200-1000 comments-per-thread range. They manage okay, mostly due to have a strong sense of community <i>and</i> several moderators <i>and</i> having Teresa Nielsen Hayden to ride herd on it (one of the folks who moderated BoingBoing when they reinstated comments).<p>Here are her (very cogent) thoughts on how to moderate massive discussions:<p><a href="http://nielsenhayden.com/makinglight/archives/008856.html" rel="nofollow">http://nielsenhayden.com/makinglight/archives/008856.html</a>