So, you're trying to share some files with someone who only has access to an old version of Word. Or maybe that Microsoft-hating friend of yours who only uses WordPerfect. Perhaps you want that old-school ebook to be an epub, rather than .lit. For any of these problems, there are desktop apps that work, of course. However, sometimes you want to be able to do that within a program. If so, Doxument and the beautiful Doxument API are what you need.
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.