Amazon has updated the iOS version of its Kindle e-reading app to v3.9. Via the app's Library Search, users should now be able to search through Amazon's catalog of free book samples and download the content straight to a device. Amazon doesn't allow direct purchases of books in iOS however, as Apple claims a 30 percent cut of all in-app transactions. Instead titles must be bought via the web, the Kindle hardware, or one of the other Kindle apps for platforms like Android and Windows Phone.
