Clarifying Amazon Kindle Sales Figures

As Amazon unveiled the Kindle 2 this morning, there was confusion among readers and reporters about what percentage of Amazon's book sales were Kindle books. PaidContent quoted Bezos: "Today, more than 10 percent of the units we sell are Kindle books." Both GalleyCat and Engadget also used that initial figure. CNN reported: "Its texts account for 10 percent of Amazon's book sales...