node-flickrapi is a library for implementing the Flickr API in Node.js. It comes with API method proxying and OAuth API key authentication, and its dependencies are the async, glob, open, progress, prompt, and request packages. node-flickrapi is released under the MIT License.
Something new sprang up in the Flickr App Garden last month: "This is my Cam!" by Chris Martin (the San Francisco-based hacker, not that guy from Coldplay). Inspired by music sharing site This Is My Jam and built during Photo Hack Day 3, "This is my Cam!" uses the Flickr API to catalog the different cameras that were used to capture a particular user's photos.
If you're looking to run a successful developer program, you should probably pay attention to Mathys van Abbe. He's the founder of Mobypicture (our Mobypicture API profile), which has just celebrated its 500th developer.