This site features a number of useful documents on the 1968 My Lai massacre, the cover-up, and the trial.
PBS presents a site dedicated to the military history of the Vietnam War. It includes detailed descriptions of weaponry and strategies used on the battlefield.
The New York Times offers a number of archived articles about the fall of Saigon printed in the paper in the days leading up to and following the final moments of the war.
To mark the 25th anniversary of the fall of Saigon, Asia Source has compiled several fascinating articles that help illustrate the complicated legacy of the Vietnam War.