Kindle has reached its tipping point, and now the Sony Reader has, too. Earlier this year the 10 millionth book was downloaded from the Sony Reader Store, Phil Lubell, v-p of digital reading at Sony Electronics said today. “We are well on our way to doubling this number by year's end," he said. Since launching its digital reading business, the company has seen “steady growth, month over month, year over year. In fact, device sales for the second quarter of this year are about triple what they were for last year,” he said.

Late Tuesday afternoon Apple announced that it sold 3.27 million iPads from the time the tablet was released in April through the end of the second quarter June 30. iPad revenue topped $2 billion.