1. Keep it clean.
2. Be constructive. Don't like something? Tell us why, not just that it sucks. If you've got suggestions for improvement, absolutely include those.
3. Don't insult each other. Seriously, just don't. Don't make me have you guys hold hands and sing Kumbaya, because that could get awkward. But I'll do it.
4. Stay on topic. Stay on Topic. Stay on topic.