You can now make your book, music and app purchases from any of your devices automatically download to the other devices you want them on regardless of when and where you make the purchases and whether you've been able to sync in the meantime. Turn automatic downloads on for books across your devices, for instance, and you can be sure the book you're reading on your iPad will be on your iPhone when you're waiting at the doctor's office, open to where you left off. Likewise the music you bought on your laptop and want to play for a friend from your iPhone or iPod touch. To turn on the automatic downloads you want on each of your iOS devices, go to the Store section of the Settings app. On your computer, select the Store tab in iTunes Preferences.