Joseph Pulitzer on journalistic ethics
This is the guy responsible for creating the Pulitzer Prize. Here's what he offered as a set of principles:
… fight for progress and reform, never tolerate injustice or corruption, always fight demagogues of all parties, never belong to any party, always oppose privileged classes and public plunderers, never lack sympathy with the poor, always remain devoted to the public welfare … (source)
Overall they seem like a pretty good set - I'm just not sure that a lot of modern papers live up to them particularly well.