I am actually a fan of Slashdot's moderation system - sadly nobody really uses their codebase these days though.
There doesn't appear to be much in the way of user comment scoring/moderation for Wordpress, but I believe bbPress has some standard voting features. Perhaps something which could be explored later, once the two are integrated - allowing scoring on the forum (or within WP) to affect view thresholds would work quite well.

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