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.
Flickr has announced the release of two new Flickr API methods. The new methods are related to what are known as the Flickr Pandas, an experimental service where several virtual pandas select safe, public Flickr photos they consider interesting, or photos which have been geotagged.
Instagram made API news today with new comment features, and a major upgrade. The Instagram Platform API has upgraded to Facebook's Graph API. This allows greater flexibility to access Instagram data from third party tools. Instagram commented that the API will be available to all developers soon.