iStockphoto executive vice president Kelly Thompson said the company did not specifically focus on traditional clients, such as advertising, graphics, interactive design and publishing industries, but they were coming. Thompson says recent reports indicate iStock selling as much as 55% of all stock imagery in North America. "It's safe to say that most people who use stock use us at least some of the time."

The corporate accounts program was created at the request of large iStock customers, who purchase over $600 in credits at one time and have more than one person buying imagery. Thompson said these customers do not get additional discounts or other perks. Rather, a corporate account is a convenient way of managing and distributing credits within an organization. It also enables the corporate decision-maker to monitor and control staff spending.

Over 350 companies have already signed up. Thompson said these include graphic-design firms, large businesses with in-house design departments, as well as faith-based organizations and non-profit agencies.