PhotoMuse
A joint project by the International Center of Photography in New York City and the George Eastman House in Rochester (the world's oldest photography museum), PhotoMuse remains a work in progress. The site's current online database of images is just a fraction of the ultimate goal of 200,000 by the fall, but it's a fine start. Search by photographer — there are two dozen listed in the drop-down menu, including Weegee (109 works) and Gordon Parks (40) — or keyword. Not to miss: Alfred Eisenstaedt's 1963 shot of children at a puppet theater in the Tuileries, Paris.