LINKS:
National Security Archive, The Pentagon Papers: Secrets, Lies and Audiotapes
Pentagon Papers (Gravel Edition, Full Text)
Archipelago, Senator Mike Gravel's Introduction to the Pentagon Papers (with assorted documents)
Nixon Tapes: Discussing Ellsberg and the Pentagon Papers (nixontapes.org)
Additional Reading:
Ellsberg, Daniel. Secrets: A Memoir of Vietnam and the Pentagon Papers (Penguin, 2003).
Herring, George (editor). The Pentagon Papers (McGraw-Hill, 1993).
Prados, John and Porter, Margaret Pratt. Inside the Pentagon Papers (University of Kansas Press, 2004).
Rudenstine, David. The Day the Presses Stopped: A History of the Pentagon Papers Case (Univ. of Calif. Press, 1996).
Salter, Kenneth W. The Pentagon Papers Trial (Editorial Justa, 1975).
Schrag, Peter. Test of Loyalty: Daniel Ellsberg and the Rituals of Secret Government (Touchstone, 1975).
Ungar, Sanford J. The Papers and the Papers: An Account of the Legal and Political Battle Over the Pentagon Papers (Notable Trials Library, 1996).
Video:
The Most Dangerous Man in America: Daniel Ellsberg and the Pentagon Papers (First Run Features, 2010)(Judith Erlich and Rick Goldsmith, directors).
The Pentagon Papers (Paramount, 2003)(Rod Holcomb, director).
Audio:
Top Secret: The Battle for the Pentagon Papers (L.A. Theatre Works, 1999)(by Geoffrey Cowan and Leroy Aarons).