Amazon is listing the much-anticipated Kindle 2 e-book reader as in stock at its online store, or one day ahead of its earlier expected release date. The second generation of the device is thinner (0.36in), has a 20 percent faster e-paper screen and improves battery life by 25 percent. Storage comes from 2GB of internal flash memory. A newfound feature is the Kindle 2's text-to-speech capability t