Straight from the horsey's mouth:
"We're excited to tell you that starting today, Kindle and Kindle app customers can borrow Kindle books from more than 11,000 libraries in the United States. When you borrow a Kindle book from your local library, you'll find all the unique features you love about Kindle books:
--Whispersync automatically syncs your margin notes, highlights and bookmarks - even once you return a Kindle book to your library, we're going to back up your notes and bookmarks, so the next time you check out the book (or if you decide you want to buy the Kindle book) your notes and bookmarks will be there, waiting for you.
--Read Everywhere - when you check out a Kindle book from your local library, you can read it on your Kindles and your free Kindle apps for the most popular devices and platforms.
--Real Page Numbers - our page numbers match the page numbers in print books, so you can easily reference and cite passages and read alongside others in your book club or class.
--Facebook and Twitter Integration - Share meaningful passages with friends and family with built-in Twitter and Facebook integration.
--Wireless delivery - Your Kindle library books can be delivered via Wi-Fi, so there's no need to transfer books to your Kindle via USB.
To learn more about borrowing Kindle books from your local library, go to www.amazon.com/kindle/publiclibraries. To find out if your library will have Kindle books available, visit your library's website.
We love libraries - they're a great way to discover new authors and genres, so we're excited to hear what you think of getting Kindle books at your local library.
Let us know!"