Well, here's the rules I laid down when I modded @ spacebattles....though I've updated them since the last time they were written was back in early 2001.

1. Spam. I don't mind the occasional joke thread or something thats really amusing but don't make a habit of posting every damn joke you find in its own thread or something. Also, posting just to increase your postcount is not tolerated. Doing so will result in a deduction of 100 posts for each +1 post. Repeat violations will result in a two-week ban.
2. Flaming. As long as it doesn't get too bad, I'll turn a blind eye. However, racial insults is one thing that I have zero tolerance for. I'll ban your ass on the spot. If you can't keep a cool head (ie: flaming every post) then I'll leave a warning to cool it. If you continue, then I'll close the thread and leave you a second warning in your PM box or e-mail inbox if you don't have PMs enabled. If you insist on continuing, I will ban you for two weeks. After that time, you will be on probation for an additional month. Keep it up, and you're gone for good. I will not tolerate trolls harassing members.
3. Warez. This is something that I will not have on my forum. Talk about this elsewhere. I will only give one warning, and this is it. Discuss it here (as far as providing links to such websites, etc. I don't mind if you're *discussing* the TOPIC of warez.) and you get the boot.
4. Pornographic material. Again, I have zero tolerance for porn on this forum. There are underage members here and I do not appreciate such material being posted here. There are plenty of other places to discuss such material. Go find one.
5. If you have a problem with any moderator, please go by the following guidelines:
a. Contact the moderator in question privately and try to resolve things in a
civil manner.
b. If you cannot resolve the issue, contact a Super-moderator and explain the problem WITHOUT resorting to flaming the moderator in question. (You'll find that this works quite well when trying to solve personal problems.)
c. If you STILL can't get it taken care of, contact one of the board administrators. They are the supreme authority and the entire staff must listen to them if they want to keep their jobs.
Do NOT post your gripes in a new thread. I will delete it on sight and not give it a second thought. If a second post is made, you will be banned.
Please note that the forum I modded used vBulletin software (same software this forum uses) so the particular board you have may not have the ability to grant members Super-moderator capability. The only other forum software that does this out-of-the-box is phpBB. There may be others, but I haven't had any experience with other software (other than UBB 5.x, vB 1.x & 2.x, and phpBB 1.4.x) so I couldn't tell you.
