The document summarizes market research on the e-reader market in 2010-2012. It finds that in 2010, Amazon dominated the market with 41.5% share and 4.5 million Kindle units sold. The overall e-reader market grew rapidly over this period, from $2 billion in 2010 to an estimated $10 billion by 2012. The market is predicted to continue growing as tablet adoption increases in coming years.