No longer a
Slashdot-only idea as many large sites are using meta-moderation.
Gamefaqs a site dedicated to
video game guides now uses it to help keep
tabs on the moderators.
Of course the tabs are a joke when 99 percent of the people don't know the real terms of service but it's a good idea to help keep the masses from realizing that they really don't have a say.
More sites will start to do this if they have unique forum systems. I don't believe the predominate bulletin board system, PHPBB2 has yet acquired this idea yet nor will it. Though it does have merits if actually listened to, there is no way to know if it really is listened to.