http://www.comicbookresources.com/?page=article&id=21693
http://www.noisetosignal.org/2009/06/the-itunes-of-comics
http://gillen.cream.org/wordpress_html/?p=1718
http://forbiddenplanet.co.uk/blog/?p=13577
http://www.ifanboy.com/content/articles/Digital_Comics_Next_Step__Longbox