I've suggested this on my local reef boards, but alas, it was not taken up. My suggestion, and I have NOOOO idea if this is even possible, is to have a little "home page" where each person can post the coral frags that they have available for sale/trade with pictures. This way, owners can keep them updated with current stock and it would likely result in more trading all around. Make it a pay service if you'd like. I know this is basically what frags.org is, but since we are a little family here, I think it would help out a lot. Of course, again, it may not even be possible.