To make Amazon.com's recently launched A9 Yellow Pages a visual experience, company reps have been driving across the country taking pictures of storefronts. Here's how it works: At A9.com, you click on the Yellow Pages button, then enter a company's address in the search field. "A9 Yellow Pages," says Barnaby Dorfman, A9's director of product development, "gives small companies a free way to increase their chances of being discovered."