Survey Shows Growing Strength of E-Books - NYTimes.com

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"Over all, digital books kept up their explosive growth in 2011, the survey confirmed. Publishers’ net revenue from sales of e-books more than doubled last year, reaching $2.07 billion, up from $869 million in 2010. E-books accounted for 15.5 percent of publishers’ revenues.
But as digital revenue grew, print sales suffered, dropping to $11.1 billion in 2011 from $12.1 billion in 2010."

Survey Shows Growing Strength of E-Books - NYTimes.com