Flickcurl is a library for implementing the Flickr API in C. This library supports the entire Flickr API, including functions for browsing, searching, and uploading photos and videos. It comes with a program called flickrdf that turns a photo's metadata, tags, machine tags, and places into RDF triples descriptions.
Ocutag, a division of Ricoh Innovations, aims to help apps deliver content to users taking photos. Their aim is to herald a new model of retail. App designers upload images and tag them with information. When users snap pics of the same thing in reality, information can be delivered through the app, such as that appearing in the graphic of the scarf below: where to buy it, details about it, local stores that carry it. What information is delivered is up to the company with the app. The company provides the Ocutag API for integration.
There is nothing more satisfying than sharing that once in a lifetime shot with the world, except maybe seeing that it has been viewed by a few thousand people. These kinds of stats have been collected by Flickr for quite some time, and now they are available to developers thanks to some new functions added to the Flickr API.