The most important one in my book would be:
- Don't take anything you read too seriously. If you do feel that a certain member's post, personal message or email is aggressive or offending to you as a person, inform an admin/mod.
By "offending to you as a person", I mean (basically) flaming, but on a much more serious scale. Also, I figure that it makes sense that the rule should only apply to emails that have come from this forum.
Of course there are the obvious ones like "No advertising threads/spam" and "No mindless spam". Most are probably already on your list.
PS - I hope people don't take my interest in these forum guideline posts and the like the wrong way simply because I'm still a new member. I've been admining forums for well over five years now and I just like to pass on my experience and "expertise" (if you could call it that

).