"By most measurements, digital books are a mere page in the novel of publishing, which hovers annually around $25 billion. But in the last year, what was a budding niche market has had a major growth spurt.
"The Association of American Publishers (AAP), the industry’s primary trade group, has tracked digital book sales since 2003, when wholesale revenues amounted to $20 million. By 2007, that number had ambled up to $67 million. But in 2008, the figure nearly doubled to some $113 million.
"This year is off to an equally heady start, says Ed McCoyd, director of digital policy for AAP, pointing to the whopping 173 percent jump in sales from January 2008."