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FreeFoto.com
http://www.freefoto.com
The biggest collection of free photos for private non-commercial use on the Internet. Site is well laid out and pictures load quite quickly.
Subjects:   Pictures & Multimedia  

Google Image Search
http://images.google.com
Quick and easy image search from the search engine with the highest number of sites indexed. Includes advanced searching and its own help section.
Subjects:   Pictures & Multimedia  

The NYPL Picture Collection Online
http://digital.nypl.org/mmpco
A searchable and browseable collection of 30,000 digitized images from a variety of sources, mostly created before 1923. Subjects run the gamut from costume and dress to punishment devices.
Subjects:   Pictures & Multimedia  

WebShots - Your World of Photos
http://www.webshots.com
A huge database of photos, browsable by subject or searchable by keyword.
Subjects:   Pictures & Multimedia