here are the rules of forum ettiquette that were posted here a couple of years ago.

Rule 1: Remember the Human
Rule 2: Adhere to the same standards of behavior online that you follow in real life
Rule 3: Know where you are in cyberspace
Rule 4: Respect other people's time and bandwidth
Rule 5: Make yourself look good online
Rule 6: Share expert knowledge
Rule 7: Help keep flame wars under control
Rule 8: Respect other people's privacy
Rule 9: Don't abuse your power
Rule 10: Be forgiving of other people's mistakes

for elaborations:
http://www.albion.com/netiquette/corerules.html