NASA has uploaded the entire catalogue of its 8,4000 Apollo mission photographic archive onto Flickr - with images spanning the Apollo 7 mission (the first manned test flight in 1968) through to Apollo 17, the final lunar mission in 1972. The images were caught by astronauts using a modified Hasselblad camera. The images are absolutely fabulous!
NASA says: "still images, audio files, video, and computer files used in the rendition of 3-dimensional models, such as texture maps and polygon data in any format, generally are not copyrighted. You may use this material for educational or informational purposes, including photo collections, textbooks, public exhibits, computer graphical simulations and Internet Web pages. This general permission extends to personal Web pages. The NASA logos are protected and NASA adds: "NASA should be acknowledged as the source of the material except in cases of advertising. See NASA Advertising Guidelines." adding "If the NASA material is to be used for commercial purposes, including advertisements, it must not explicitly or implicitly convey NASA's endorsement of commercial goods or services. If a NASA image includes an identifiable person, using the image for commercial purposes may infringe that person's right of privacy or publicity, and permission should be obtained from the person. Current NASA employees, including astronauts, may not appear in commercial material".
NASA's policies for using images can be found here: http://www.nasa.gov/multimedia/imagegallery/reproduction_guidelines.html and here http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html