It's been awhile since we've seen a creative use of the Flickr API. Jacob Seidelin wrote Wolfenflickr entirely in JavaScript. It's a take-off of early 90s Wolfenstein 3-D, which popularized the first person shooter genre of video games.
In Seidelin's version there's no shooting, but you can navigate a "secret level." Instead of Nazi flags, there's art in the form of Flickr photos. You can pass it your username to see your photos, or a search term to see the results on the walls of Castle Wolfenstein. It's been having trouble loading all the pics for me, but if you use your up arrow to go straight ahead you'll find a room where the images appear to load first.
I hope examples like this will encourage others to use the Flickr API. The image sharing granddaddy has always embraced their developer community, most recently with a dedicated Flickr API site. Check that out for lots of information about the technical side of Flickr. To get started with your own app, be sure to check out our Flickr API Tutorial.
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