Given the brisk sales of Kindles, Nooks and iPads over the last few months, it doesn't come as a surprise that the sales of e-books are also flourishing. According to the Association of American Publishers (AAP), e-book sales for January to August are up from $89.8 million for 2009 to $263 million in 2010. This 193% increase in sales means that electronic books now account for almost 10% of consumer book sales in the U.S., up from just 3.31% in 2009. All of these numbers exclude textbooks and other academic texts, so the actual numbers are likely even higher.