From January through August of 2010, eBook sales totaled $263 million–a 193 percent increase compared to the same period last year. eBook sales increased 172.4 percent in August, reaching $39.0 million.
Here’s more from the Association of American Publishers (AAP): “Trade book sales (not including books for academic study) for the period of January-August 2010 had sales of $2.91 billion. eBook sales in the same period were $263 million.. E books for the period comprise 9.03% of total consumer book sales, compared to 3.31 percent at the close of 2009.”
You can see the eBook growth mapped in the AAP chart embedded above. GalleyCat has more about sagging adult hardcover sales in August. The complete sales release is embedded below.