During its investigation into the current Gulf of Mexico oil spill, The Associated Press was given information from the then-office of Mineral Management Services that was not making a lot of sense.
As millions of gallons of crude spewed into the gulf waters and the oversight by MMS officials on British Petroleum's well was being called into question, an anonymous source in that office told reporters far different stories than what they had been initially told. This anonymous source set the record straight by coming forward and speaking out, and suddenly the world knew that this was more than a mechanical failure; it was a full system failure. The people hired to keep these events from occurring were ignoring their responsibilities.
At times, anonymous sources provide crucial information to the press. Stories of oil disasters may be the latest, but without citizens coming forward and sharing vital information, Americans would not know about steroids in sports, excessive military spending, or food and drug hazards. We would never have been told about Watergate.