This is an interesting idea. If it gets me reading article and blog comments, I’ll be impressed.
The [Washington] Post will implement a system that should help. It’s still being developed, but Straus said the broad outlines envision commenters being assigned to different "tiers" based on their past behavior and other factors. Those with a track record of staying within the guidelines, and those providing their real names, will likely be considered "trusted commenters." Repeat violators or discourteous agitators will be grouped elsewhere or blocked outright. Comments of first-timers will be screened by a human being.
When visitors click to read story comments, only those from the "trusted" group will appear. If they want to see inflammatory or off-topic comments from "trolls," they’ll need to click to access a different "tier."