On March 24, 2000 American author of contemporary horror, suspense, science fiction and fantasy Stephen King first published a novella entitled Riding the Bullet as an electronic book through Simon & Schuster, using technology by Softlock. Available for $2.50, it was the first mass-market e-book. However, there were technical problems with downloading, and hackers eventually cracked the encryption.
"A movie adaptation of the story, starring Jonathan Jackson and David Arquette, was released in 2004" (Wikipedia article on Riding the Bullet, accessed 10-19-2013).
♦In 2010 Stephen King was interviewed on CNN about the present state and future of books and ebooks: