Our API directory now includes 62 image APIs. The newest is the Pic Resize API. The most popular, in terms of mashups, is the Yahoo Map Image API. We list 12 Yahoo Map Image mashups. Below you'll find some more stats from the directory, including the entire list of image APIs.
As announced on the Flickr Blog, Flickr has launched a new website for developers: Flickr Code. And besides announcing the new site they've both a) given interesting details on just how much API traffic they do each day (see below), and b) they announced they're open sourcing Flickr Uploadr, the cross-platform (Windows and OS X) desktop tool for uploading photos to Flickr.