According to the Association of American Publishers (AAP), eBook sales jumped 127.4 percent in April compared to the previous year--totaling $27.4 million in sales. In comparison, audiobook sales were $11.7 million for the same month.Nevertheless, March 2010 was a better month for eBooks. As we reported, sales totaled $28.5 million that month. Follow this link to see stats for adult and children's/YA sales in April. ...