Lesson 3 also included a link to a Trading Card maker, yet again by using Fickr photos, at http://bighugelabs.com/flickr/deck.php

Additional MASHUP options for Flickr are at: http://www.flickr.com/services/

Web Applications: http://www.flickrbits.com/#webapps (where you will find some overlap of things already mentioned)

And Flickr Tools: http://www.quickonlinetips.com/archives/2005/03/great-flickr-tools-collection/