Core Rules:

Rule 1: Remember the Human 
Do unto others as you'd have others do unto you. Imagine how you'd feel if you were in the other person's shoes. Stand up for yourself, but try not to hurt people's feelings. 
 
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 
Be clear and logical. Don't post flame-bait. 
 
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 
 
*Excepts from netiquette by Virginia Shea* 
 
P.S. For those who are not yet aware of this, posting in ALL CAPS is the equivalent of shouting. In my opinion, this should be used judiciously or few  people will bother reading your posts, no matter how good the thesis. Good manners do go a long way, as do logical, well-thought out arguments.