Number of times Amazon has disclosed how many Kindles it’s sold: zero, but the company maintains that the device is its best-selling product
Number of times Barnes & Noble has provided shipment numbers for the Nook: zero – but the device became its biggest bestseller in its nearly 40-year history over the 2010 holiday shopping season
Amazon’s estimate of the Kindle’s eReader market share: 70 percent to 80 percent
Barnes & Noble’s estimate of the Nook’s market share: 20 percent
Analyst estimates on the number of Kindles Amazon sold in 2010: 5 million
The Kindle’s market share, as estimated by a ChangeWave survey last May: 62 percent
ChangeWave’s estimate of the Nook’s market share: 3 percent
Percentage of survey respondents who identified the iPad as their eReader device: 16
Global sales estimates for connected eReaders in 2010, according to Gartner: 6.6 million, up from 3.6 million units in 2009
Shipment estimates for 2011: more than 11 million
eBook sales in the first 10 months of 2010, according to the Association of American Publishers: $345.3 million, compared with $127.3 million during the same period in 2009
Price of the Barnes & Noble Nook before Borders began selling the $139 Wi-Fi only Kobo eReader: $259
Price of the Amazon Kindle before the Kobo eReader came to market: $259
Prices of the Barnes & Noble Nook and the Amazon Kindle after the Nook went on sale: $199 and $189, respectively
Price of the Wi-Fi only version of the Nook: $149
Price of the Nookcolor: $249
Price of Amazon’s third-generation, Wi-Fi only Kindle: $139
Price of the Kindle DX, which has a 9.7-inch screen and 3G connectivity: $379
Compiled by Wireless Week Associate Editor Maisie Ramsay