I was on another forum and I noticed a habit some of the better photographers on there had whenever offering critique they posted an image of their own as a sort of credential. I was thinking that this might be an interesting way to get the critique section back up. Require people to have a link to their portfolio (or flickr for amateurs) in their sig if they're going to post in the critique section. This would of course work better if you could find someone who wanted to moderate this and only this section. While it might not reduce the signal to noise ratio in the section it would provide a way for the posters to filter out the noise themselves. I'm not saying this would work or that it is a good idea just some food for thought.