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 CCD record of the entire sky.
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 . This is an ambitious project that will take time to realize. Meanwhile, there is already much to explore and enjoy.