I second foxman's idea.

The people in the respected group should atleast submit 1 article per week (c'mon its not hard to remove just 1 hour of time from your schedule). Other than that, the people who are willing to volunteer (must have a good knowledge & popularity over here) would be allowed to post articles, or maybe post the article and put it under moderation.
If its up to the level, it will be published

Hows that ?