iPad demographics vs. Kindle demographics (US data)

"Apple iPad users are younger and more of them are male than those of other connected devices
- 65% are male, 63% are under the age of 35
- Kindle users: 52% male, 47% under the age of 35
- Amazon Kindle users are slightly wealthier, better educated
- 28% have incomes of $100k or more, 57% have a bachelors degree or higher
- Pad users: 25% have incomes of $100k or more, 51% have a bachelors degree or higher"
Source:  The Increasingly Connected Consumer: Connected Devices, The Nielsen Company, October 2010 (pdf)