UserPreferences

FlickrSystem/ApiExample/RestCalls

I will also throw in a few RESTful ways of accessing the Flickr API (substitute the appropriate parameters):

getting the photos from a certain photoset: http://www.flickr.com/services/rest/?method=flickr.photosets.getPhotos&api_key=YOUR_KEY&photoset_id=PHOTO_ID
setting permissions on a particular photo: http://www.flickr.com/services/rest/?method=flickr.photos.setPerms&api_key=YOUR_KEY&photo_id=PHOTO_ID&is_public=1&is_friend=1&is_family=1&perm_comment=1&perm_addmeta=1