Many institutions are sharing images on flickr. I've begun to list a few of them here. If you know of others please bring them to my attention.
- Aerial Photographic Archive for Archaeology in the Middle East flickr Photostream
- American School of Classical Studies at Athens flickr Photostream
- The Brooklyn Museum flickr Photostream
- Centre for Egyptological Studies of the Russian Academy of Sciences, Moscow (CESRAS) and the Russian Institute of Egyptology in Cairo (RIEC) flickr Photostream
- The Egypt Exploration Society flickr Photostream
- Institute for the Study of the Ancient World flickr Photostream
- The Monuments of Syria flickr Photostream
- The Palestine Exploration Fund flickr Photostream
- The University of Pennsylvania Museum of Archaeology and Anthropology flickr Photostream