Kindle for iOS introduces sample downloads and custom dictionaries

It's been a while since Kindle for iOS users have been able to download content directly from the app, thanks to Apple's 30 percent fee for in-app purchases. Today, Amazon is reintroducing that feature -- albeit a modified version -- in its latest update, available now in iTunes. From the existing library search, you can browse Amazon's store for sample downloads where available. You won't be able to purchase the full book, but you can at least discover new content in a slightly more efficient m...