From ESPN of all places comes The Powell Doctrine of Journalism/Blogging:
“Look, I have got a rule,” he said General Powell told him. “As an intelligence officer, your responsibility is to tell me what you know. Tell me what you don’t know. Then you’re allowed to tell me what you think. But you always keep those three separated.”
Not bad advice, especially for journalists (or those wishing to be respected as such).
(h/t to kottke.org)