W. Mark Felt was 'Deep Throat' and helped us immeasurably in our Watergate coverage," Mr. Woodward and Mr. Bradlee said in a statement.
Bob Woodward said Mr. Felt helped The Post at a time of tense relations between the White House and much of the FBI hierarchy according to the Washington Post.
"The number-two guy at the FBI, that was a pretty good source," Mr. Bradlee told washingtonpost.com. "I knew the paper was on the right track."
Still goes to show you that a journalist can keep a secret.
(and thanks Musky -- Linda Lovelace will always be deep throat in my head (and video collection))