Still, this is just another great reason to jump on the ereader bandwagon. I love the convenience and portability of my Kindle. I've saved so much time, money, and apartment/luggage space since buying my first Kindle a little over a year ago. I also feel great that I'm playing some small part in saving the environment. Definitely a great investment.
For more information on how to loan Kindle books, go Here.
The topic discussion can also be viewed Here.
Lending Sites: Booklends, Kindle Lending Club, Books 4 My Kindle
There are couple of ways to find out if a book is loanable. You can check on the Top of the Product Page of an already purchased book, where it will contain a "Lend this Book" button.
You can also check the lending status of any book by going to a Book's Product Details info area, which is a quarter the way down the page. If you see the text "Lending: Enabled" the book is loanable. Unfortunately, there is currently no easy way to search through loanable books.
You can also find out if your previous purchased books are loanable, by going to "Manage Your Kindle" and expanding on the book's details button (+).