Ad*Access
Images and database information for more than 7,000 advertisements printed in U.S. and Canadian newspapers and magazines between 1911 and 1955.
Artcyclopedia
Great art online, from more than 8,000 famous painters, sculptors, and photographers, at art museum sites and image archives worldwide.
British Library Images Online
This site provides "thousands of the greatest images from the British Library's collections, which include manuscripts, rare books, and maps spanning almost 3,000 years." Searchable, or browse by subject or title.
Digital Librarian: Images
Hundreds of image collections, from "Abandoned Places" to "World War II Poster Collection".
New York Public Library Picture Collection Online
"A collection of 30,000 digitized images from books, magazines, and newspapers as well as original photographs, prints, and postcards, mostly created before 1923".
Picture History
"Digital library of high-quality images and footage illustrating more than 200 years of American history. Images can be licensed, purchased, or sent as a free e-card" from the site.
The Urban Landscape
"Contains 1,000 images pertaining to the theme 'The Urban Landscape,' from 14 different collections".