He kind of looks like Hal Holbrook

via New Media Musings: "The Washington Post today confirmed that W. Mark Felt, a former number-two official at the FBI, was 'Deep Throat,' the secretive source who provided information that helped unravel the Watergate scandal in the early 1970s and contributed to the resignation of president Richard M. Nixon."

As someone who, as a teenager, watched the hearings and followed Watergate fairly closely, this is huge.