Anatomy of a flickr tag feed

flickr gives you rss feeds for a number of things. They have a list of available feeds , but a tag feed it not on the list. I can't remember how I found it, but you can create a feed in your news reader for any tag. Any photo uploaded with the tag you choose will show up in the feed. For example, this feed will yield any photo tagged with the word "pirate":

http://api.flickr.com/services/feeds/photos_public.gne?tags=pirate&lang=en-us&format=rss_200