tweetmeme_url = 'http://www.readwriteweb.com/archives/digital_textbooks_set_to_capture_almost_20_of_the_market_by_2014.php';
tweetmeme_source = 'rww';
Xplana predicts that digital textbooks will account for almost 20% of all textbook sales within the next five years. This will make digital textbooks a $1 billion market.