I'm having some trouble with this so far...
A) The layout is interesting, kind of like the StackExchange sites, which is cool. But it need some work. If there is a "new" message since my last visit, there is no indicator (that I've noticed, at least) to quickly draw my eye there. And nothing is collapsed. So I have to basically re-read everything. Not good.
B) When replying to a comment, the text box is only big enough to accommodate a single line of text! Yes, I can expand it, but come on. Pre-size it a bit larger. Please.
C) Moderation is going to be necessary. The thread today on some butter brand is not going to be uncommon. Please police and move stuff out of there quickly. You'll almost NEVER see me asking for more moderation, but this is one case where -- at least early on, until things get established -- it will be quite helpful.