E-Reader market share: Kindle 47%, iPad 32%
According to a new study by ChangeWave, the Kindle has 47% of the e-reader market, while the iPad has 32%. This is true for November 2010. Interestingly, in August, the iPad has 16% while the Kindle had 62%. According to another study by Gfk-MRI, total e-reader ownership in the US has reached 5.9 million.
It's very difficult to compare these two devices, as the iPad is not really an e-reader (at least not just an e-reader). In any case these two devices are selling extremely well.