So, you've finished another book. What are you going to do with it now? I'll bet you'll put it on a shelf and forget about it. Wouldn't you like to get another great book and put this one to better use? You can at bookends.com.
Bookins.com is a book swapping service. You can post the books that you are willing to swap on the site, and then build a list of books that you'd like to get in return. Bookins manages the swap; when you post an available book that somebody else wants, they contact you. You have two days to decide if you are willing to send the book along to the next person.
Here's the cool thing: they allow you to print a prepaid postage mailer label that you can tape to a box or envelope and simply leave in your mailbox, there is no cost to you (besides the package or envelope).
For each book that you trade, you earn points (4 to 6 for a paperback, about 11 for a hardcover book), and when you have earned enough points, Bookins looks for books on your "want" list that might be available. If they find one that matches, they arrange with another person to send the book to you. This time it does cost you; both the points that the book costs, plus $3.99 for shipping.
Click this link to put those old books to a better use at http://www.bookends.com.