I threw my hat in for Great Write Meme
I admit that I was (and still am) not too sure about it, but it seems like quite a few people are getting useful concrit over there. I've been impressed that a lot of people have kept it on the mature side.
I'd like to think I'm open to concrit and will take it in the spirit it's offered, but I don't always know how I come across to people. So if you've ever felt nervous about pointing out one of my issues, you can do it here. From what I understand, it's all anonymous (it's actually required that you comment anonymously) and IP tracking is off.