Amazon has released an update to their Kindle app for Android phones, and the update adds several important improvements. The app now has the ability to search within books either by typing or by voice. You can add, edit and delete notes and highlights and it now supports direct links to Shelfari, which is Amazon’s social networking site about books. To go to the Shelfari site tap and hold on a book title in the library and select Shelfari, which then opens the site in the Android browser. The Kindle app now has an orientation lock. Switch the phone from portrait to landscape, or vice versa, and a little lock icon appears on the screen. Tap the lock icon to lock the screen in the orientation, and the icon goes away. To unlock the orientation, move switch your phone again and the icon re-appears. The Amazon Kindle app is free and available in the Android Market.