Kooaba offers image recognition through its Kooaba API, allowing you to compile metadata on objects in your photos. This can be used for product recognition and pricing, but could also be used to augment personal photo collections, which can be so large that they are nearly impossible to search by hand. There are tons of use cases for image recognition and this API should really open up the field and bring more applications to market.
Technology and entertainment retailer Best Buy is leading the way with the latest addition to the Best Buy API. It now allows developers to not just search the company's catalogue, but also complete the purchases within their own applications. Developers then earn a portion of the sale, which one would expect to be more likely than when applications must hand off the customer to Best Buy's site.