Flickr Machine Tag Tree - A Machinetag App
Description: This app fetches the last 20 photos of a given user and displays them in a tree organized by machine tags. If there's demand I may increase how many photos it fetches. You can always download Machinetag and customize this app to your liking.
Instructions: To use this machine tag tree you need a flickr user id of someone who actively machine tags their photos. You can use this bookmarklet on a Flickr user's home page (for example) to have it automatically filled for you. You can also get one for a given user name. Some user ids you can try: 33047461@N05 (musicbrainz/wikipedia), 38211171@N00 (astronomy) and 53755594@N00 (address/geo).