My blog gets several hundred comments a day and has almost 300 registered commenters. A small minority of them post a lot of drivel which drowns out the good comments.
What I am after ideally is a system (maybe like Slashdot's Karma) where people can vote on the quality of comments, and hide comments below a certain quality. And ideally one where someone who continually makes lowly rated comments, starts off with a lower default rating (so they have an incentive to post better quality) - again much like slash dot. But I am open to anything even if not exactly that.
I have tried searching myself for such a plugin but no luck. Any help greatly appreciated.