a few additional NASA imagery Web sites that you may find helpful:
to Astronaut Photography of Earth- http://eol.jsc.nasa.gov/SearchPhotos
The entire collection of catalog records for photos
of Earth taken during manned spaceflight missions. Continuously updated.
Human Space Flight Web, Multimedia Gallery - http://spaceflight.nasa.gov/gallery
Press release photos from shuttle missions since STS-82, press release
photos from the space station, and video, audio, and animation files from
the shuttle and space station programs. Also contains some pre-shuttle
multimedia. All new press release photos and other multimedia are published
here. Low and high resolution imagery. Continuously updated.
Shuttle Photo and Video Archive - http://science.ksc.nasa.gov/shuttle/photos
Preflight, launch, and landing photos and videos from shuttle missions
since STS-67. Low and high resolution images available. Continuously updated.
Images in NASA (GRiN) - http://grin.hq.nasa.gov
Over 1000 NASA images of historical interest. Images available in low,
high, and very high resolutions - suitable for publishers and the media.