USAToday: How to lend ebooks on your Kindle

The Kindle e-reader allows you to carry around entire bookshelves worth of titles with you, but what if you want to share one of those titles with a friend? Unlike handing over a trusty paperback, just because you bought the electronic version of a book doesn't mean you have to fork over your device to let a friend read something off your virtual shelf.
Kindle books can be loaned via the Web, allowing your book buddy to read the title on whatever device he or she chooses without your having to part with your own e-reader. Not all books purchased on the Kindle are available to be loaned out, but those that are can be shared with friends for up to 14 days at a time for no charge. Books are automatically returned after that period, so you don't have to chase your friend down to get your favorite novel back.

Check your bookshelf 

To determine if a book you own is lendable, check your virtual bookshelf by logging into Amazon's website and going to the Manage Your Kindle page within the Orders section. If the book you want to lend out is sharable, you'll see a Loan This Title option under the Actions drop-down menu to the far right of the book's name.........

http://www.usatoday.com/tech/products/story/2011-12-24/tecca-lending-kindle-ebooks/52190216/1