I apologize if this has been discussed already - I did not do an exhaustive search.
One thing I think would be helpful is a way to rate comments. I often read what I think are particularly good or weak recommendations but because of time constraints, do not add a reply to the comments. I would love to be able to give comments I like a rating (from 1-5 stars) to quickly give my opinion on the comment. Other blogs have them, and I find the ratings very helpful. It helps you more easily sort through the muck and find the most incisive comments from respected commenters.
This would be particularly helpful when using CH to find restaurants in other cities while traveling. You can more easily figure out what might be a "consensus" pick.
It might cut down on the useless "ditto" posts as well.