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Tutorial Blog has 25 sites for free & cheap stock photos
Most sites are user submitted photos, but if you need something basic, like fruit on a white background, this would be a great resource to use. These are the few that I think were the best out of the 25.
Unprofound
Different from the other sites by allowing you to search by color. (as well search by object). Looks at the FAQ, the site says you are not required to credit, display copyright or return a link to use the photos here. If you choose to do so, you can credit either the unprofound.com website or the specific photographer(s) responsible for the photo(s) you use.



FreePixels
FreePixels has some decent photos that would be suited for more corporate things. Their usage is pretty open allowing you to use in any magazine, newspaper or other publication, product, design element or promotional material (commercial or personal). But you cannot use their image to create art, logos and resell on your own. And you must give credit to at least the site.



FreeRange
FreeRange has a well designed site. It is the best looking of the bunch. The photos are shot of photographers hired by the site as well user submitted photos. A nice feature they have is a way to request imagery if they don’t have something. All photos can be used for commercial or personal projects. You do have to register to get the image. But it’s free!

(credit: French Blast)