If I can say one thing to parents about teachers it would be this:
when you communicate with your children's teachers, remember they are human. Remember that there are two sides to every story. Remember that they are professionals and they know what they are doing (most of them do, anyway). Remember that accusatory emails are no fun and just plain rude. Show your appreciation for them; they are with your child at least 1-2 hours or more a day and know them VERY well. :) It's one thing to advocate for your child, but it's another to blame and live in a world where people are not ever held accountable and enabled.