Wikipedia's Rules of Etiquette

• Assume good faith.
• Treat others as you would have them treat you--even if they are new. We were all new once.
• ...raw text may be ambiguous and often seems ruder than the same words coming from a person standing in front of you...Be careful of how you interpret what you read: what you understand might not be what the writer means.
• Work towards agreement.
• Argue facts, not personalities.
• Do not ignore questions.
• Concede a point when you have no response to it, or admit when you disagree based on intuition or taste.
• ... if other editors are not as civil as you would like them to be, be more civil than they are, not less.
• ...do not hesitate to let the other person know that you are not comfortable with their tone in a neutral way...
• Be prepared to apologize.
• Recognize your own biases, and keep them in check.
• Help mediate disagreements between others.
• If you are arguing, take a break. If you are mediating, recommend a break.
• Remind yourself that these are people with whom you are dealing.

Wikipedia:Etiquette ( September 2010)

• netiquette