A model displays Japanese electronics giant Toshiba's tablet PC "Regza Tablet AT300" as an book reader, equipped with NVIDIA's Tegra2 processor on its CPU with Google's Android OS and a 10-inch LCD display at the annual Tokyo International Book Fair in Tokyo on July 7, 2011. Some 1,200 publishers and book sellers from 30 countries exhibit at a four-day trade show..  AFP PHOTO / Yoshikazu TSUNO (Photo credit should read YOSHIKAZU TSUNO/AFP/Getty Images)