new feature: rating comments
You'll notice there is a + and a - at the end of comments now. This is a first stab at something like the way Digg  treats comments: if the community determines your comment is of little value, it won't be deleted but it will begin to fade away. In reverse, if a comment is of high value it will get called out.
There is much improvement for me to do on this feature: I need to make the entire comment fold or hide when they are marked down, I need to make the high quality comments get special treatment, and I should get the ajax piece working so that you don't need to reload each time you rate a comment. Your patience and feedback are appreciated.