A saleswoman displays an electronic book
A saleswoman displays an electronic book reader at the Computex Taipei, Asia’s largest hi-tech trade show on June 3, 2010. Taiwan’s Green Book Inc. unveiled at the fair what it called the world’s lightest electronic book reader weighing just 180 grams (0.4 pounds), as e-book makers gear up to the challenge of Apple’s iPad. (credit: PATRICK LIN/AFP/Getty Images)