Students of the Institute for Astronomy at the University of Bonn in Germany have attempted a photographic atlas of the heavens. They are trying to make it multilingual. If they can pull it aff, they will have an impressive site. Finally, there is the Digital Sky Survey, a huge project entering its second generation. This is a monochrome record of the entire sky taken with Schmidt Cameras in the United States and Australia.
Generation one is a more superficial scan of the sky.
A half degree field takes up to two megabytes. You can access the survey easily through the HAS Web site, thanks to the work of Gary Ward .