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People prefer e-books when they want fast access and portability, a new study says

An Android-powered e-reader is displayed during a consumer electronics show in Las Vegas, Nevada, in 2010. Slightly more than a fifth of US adults have reported having used an "e-book" during the past year, their ranks swollen by the popularity of Kindles, Nooks, iPads and other gadgets during the year-end holiday gifting season

Consumer Electronics Show unveils new, sexy gadgets

This year's Consumer Electronics Show in Las Vegas highlights the latest smartphones, displays and other gadgets that are invading our homes and our lives. (Photos collated from Getty Images, Reuters, and AFP)