A free short ebook on Storytelling in the Digital Age has been published by Gurpreet Mann (disclosure: Gurpreet is a former student of mine).
I’m clearly going to be biased — but I really like it, particularly because it doesn’t just address the technical challenges of new platforms, but also looks at cultural, commercial and narrative contexts. (The chapter on Tumblr and GIFs is a particular highlight).
Gurpreet wrote the book while a distance learning student on the MA in Online Journalism (now the MA in Multiplatform and Mobile Journalism) as part of an exploration of e-publishing. As well as Amazon (in the US, UK and elsewhere) the book is also available on iBooks and, interestingly as a platform for e-publishing, Academia.edu.