Stock Photo Agencies:

 

Corbis
Getty
Alamy
Jupiter Images
Aurora Photos
Masterfile
Magnum
Aperture
Panos Pictures
Glass House Images
F-Stop Images
Redux Pictures
Independent Photography Network
Monsoon Images
Arcangel Images
Trunk Images
Robert Harding
Lonely Planet
Hedgehog House
Macduff Everton Stock
Tropical Pix
Odyssey Productions
Peter Arnold
Minden Pictures
Images of Nature
National Geographic Images
Nature Picture Library
Joel Sartore Stock
Steve Bloom
Art Wolfe
EarthWater
Seapics
Terra Galleria
NHPA
Oxford Scientific
World Foto
GlobeXplorer
Orb Image
TerraServer
Aerial Photography
Aerial Stock
Land Slides
PBase
Flickr
Photo.net
LightStalkers
Nature Photographers
The Photography Links Directory