A large site with images, papers and much more. Down load a image of any position in the sky in a few seconds. It promotes open scripting tools for astronomy. A very comprehensive site with catalogs, images and lots more. You can join their mailing list at this site.
Site includes a collection of the best pictures taken by participants.
Has links to indexes of astronomical catalogs. To see the layout of the entire site use this link . The design used for the Hubble Space Telescope. Includes equipment construction and access to the Iris image processing program. His pictures are works of art.