Thinking about replacing your textbooks with an iPad Air? Amazon's trying to make the transition a little better for you. The latest update to Kindle iOS app adds flashcards and improved in-book search for print replica textbooks, giving students a better way to find the topics they need for class, as well as a convenient way to catalog and study them. The update packs in a handful of items for non-students too, including page footers that display page numbers and time left (for audiobooks), a redesigned dictionary for iOS 7, an updated X-Ray experience and a new set of Notebook filters for sorting through annotations. It's not quite as hefty as the app's recent redesign, but if you're looking for some new features for the semester, you can get them at the app store.