Stock Photography

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1Stop Stock

Meta-search engine for twelve major image providers.
http://www.1stopstock.com

Comstock Images

Searchable database of rights-protected and royalty-free images. 
http://www.comstock.com

Corbis Stock Photography and Pictures

The world's finest digital stock photography and images online
http://www.corbis.com

Dennis Kunkel Microscopy and Stock Photography Image Gallery

View scanning electron microscope pictures of interesting creatures and household items.
http://www.denniskunkel.com

Fotoseach Stock Photography

Searches a variety of stock photography vendors and offers electronic downloads of images or footage clips. 
http://www.fotosearch.com

fStop

Offers stock photos by designers for designers which are organized as personal collections rather than by contrived themes. 
http://www.fstopimages.com

Getty Images 

Royalty-free digital stock photography .
http://www.photodisc.com

Lonely Planet Images

Database of images and photos taken by travel photographers for purchase or download.
http://www.lonelyplanetimages.com

Medio Images

Amazing images for all your design needs.
http://www.medioimages.com

Mountain Light Photography

Fine art prints and stock photography.
http://www.mountainlight.com

Philip's House of Stock Photography 

Stock Photography. from Philip Greenspun.
http://www.photo.net/stock

Photos.com

Offers subscription-based royalty-free stock photography for web or print. 
http://www.photos.com

Steven Poe

Stock photos and fine art prints.
http://www.stevenpoe.com