The latest Kindle iOS app
update has some interesting new features (I think they've been getting ideas from Marvin
Kindle for iOS Version 4.4 provides several customer-requested features that make sync and navigation easier.
Sync to the most recent page read - Any books you are reading on Kindle for iOS will now sync to the most recent page read across all Kindle devices and/or reading apps registered to your Amazon account. Customers can still manually sync to the furthest page read from the left navigation menu.
Kindle Placeholders - Allow customers the freedom to explore other areas of the book without losing their current place. Jump directly to previous locations with "placeholders" on the progress bar.
Notes Export - Studying for the next exam or writing the next term paper just got easier. Students can now export notes, highlights, and more to e-mail from their "Print Replica" textbooks, giving students easy access to their information.
Wikipedia Smart Lookup - Select a word and learn more from Wikipedia in the Info Card at the bottom of the page.
Performance and stability improvements.
(Above text copied from: http://www.macrumors.com/2014/07/29/...-improvements/