Sarah Boxer in the New York Times:
Let the browser beware. The New York Public Library’s collection of prints, maps, posters, photographs, illuminated manuscripts, sheet-music covers, dust jackets, menus and cigarette cards is now online (www.nypl.org/digital/digitalgallery.htm). If you dive in today without knowing why, you might not surface for a long, long time. The Public Library’s digital gallery is lovely, dark and deep. Quite eccentric, too.
So far, about 275,000 items are online, and you can browse by subject, by collection, by name or by keyword. The images first appear in thumbnail pictures, a dozen to a page. Some include verso views. You can collect ’em, enlarge ’em, download ’em, print ’em and hang ’em on your wall at home. All are free, unless, of course, you plan to make money on them yourself. (Permission is required.)