If there is not a WordPress plugin that will do the trick I think it would be fairly simple to make one to do this using the Flickr API Flickr Services: Flickr API: flickr.favorites.getList.
If there is not a WordPress plugin that will do the trick I think it would be fairly simple to make one to do this using the Flickr API Flickr Services: Flickr API: flickr.favorites.getList.