Kindle update brings real page numbers, public notes, and new magazine layout
Also in the update is support for public notes. This lets Kindle owners choose to make their notes and highlights publicly available. A 'following' system has been implemented here, akin to that pioneered by Twitter: you can follow different Kindle users' public notes. To do that, as well as turn on Public Notes in your own books, go to kindle.amazon.com.
Newspapers and magazines have received a new layout that gives you a quick snapshot of the news to help you quickly decide what you want to read.
When you reach the end of a book, you can now immediately rate that book, thanks to a new Kindle feature called Before You Go. This will also let you share your thoughts about the book, see more books by the same author, and get personalized recommendations for what to read next.
The 3.1 software update will be pushed to all latest generation Kindle and Kindle 3G devices soon. However, if you want, you can manually install it right now by downloading the Early Preview Release from here.