I've been tracking print versus eBook sales for years. In 2008, my print sales were four times my eBook sales. In 2009, three times. By 2010, sales were almost even between the two formats. As you may have guessed, 2011 was the year sales flipped upside down--with a vengeance. In 2011 my Kindle sales alone were three times my print sales. To my surprise, the shift in format continues to accelerate. This month my eBook sales were eight times my print sales.
Author James D. Best - read the full article on his blog HERE