Interesting diaporama about motivation in floss communities : http://fr.slideshare.net/Eldarion/motivation-in-floss-communities aka "The Chocolate Talk" one funny page in it is http://image.slidesharecdn.com/fossatalk-121207034650-phpapp02/95/slide-19-638.jpg?1354978545 but there are lots of other less funny but interesting JL