While digital books account for only about 1 percent of sales, Random House will be expanding its online library of offerings. The company has a library of 8,000 in digital form and the new offerings will expand that number to 15,000 when completed in several months. E-books sales have increased by triple digits this year for the publisher with the company pointing to the Amazon Kindle as one reason for success. There is an obvious migration of material in to digital form but whether serious sales will follow remains to be seen. It’s tough to gather around the kindle for a bedtime story.