This is one of the most comprehensive search engines and websites in the world on the Vietnam War. It has over 3.2 million pages scanned materials from government and military documents, newspaper articles, photographs, maps, artifacts, sound/audio recordings, etc. Great for finding material, resources, and primary sources.
This is a Smithsonian website that uses video and text to examine armed conflicts involving the U.S. from the Revolutionary War to the war in Iraq. This is a great tool to use when examining any war the U.S. has been involved in. This site also provides many activities.