The Kennedy Space Center's Apace Flight Archives document the history of the American space program from the NASA Space Act of 1958.
The Historical Archive of the Kennedy Center provides historical overviews of NASA, rocketry and aeronautics. More in depth examinations of NASA'a space flight missions are available. These include not only accounts of the mission objectives and results, but primary documents, images, video and audio files. An excellent research source, with links to many other NASA sites of historical interest.