The Bigstock API was built for Facebook applications, print on demand services website builders, ecommerce platforms and ad creation tools. You can use the API to perform five request types: search, categories, image detail, purchase, download, and light boxes & saved images.
Instagram made API news today with new comment features, and a major upgrade. The Instagram Platform API has upgraded to Facebook's Graph API. This allows greater flexibility to access Instagram data from third party tools. Instagram commented that the API will be available to all developers soon.
Who ever said that institutions were loathe to change? Well call him up and let him know, the Library of Congress, with their Prints and Photographs API has finally taken the REST API plunge. If this government institution can do it, maybe you can convince the head of your IT department that APIs are a good idea too.