iStockPhoto – Royalty-free images for low prices; there aren’t any completely free photos here, but photo quality is above average
Fotolia – Another cheap royalty-free image provider, with nearly 2 million photos in stock
SXC.hu – One of the best (and biggest) repositories of completely free stock photography on the net.
MorgueFile – Provides completely free photos; no registration required to download.
PixelPerfectDigital – 5000+ free stock photos
StockXpert – the commercial arm of Stock Xchange; offers cheap but quality royalty-free material
Alamy – Alamy is a search engine for stock photos which boasts millions of images from thousands of photographers, picture agencies and national collections. The site does the editing and classification of the images.