NASA
Nasa Star Child: Space Travel (Level 2)
This site has the history of space travel. Includes President Kennedy's speeches on the Apollo program that can be downloaded. Many graphics, and a very complete history of space travel with links to more detailed information.
NASA
Nasa: Salyut 4
Overview of the Salyut 4 space station mission and instrumentation. Has a great picture of the computer rendering of the space station.
Curated OER
3 D Salyut
A 3-D VRML rendering of the Salyut space station. Detailed and highly interactive.