This is great news for the mom of at least one Engadget editor (who has been despairing at her inability to share e-books with Aunt Kathy). That's right: Amazon has enabled Kindle book loaning on select titles. Of course, there are caveats: books can be loaned only once, for a period of fourteen days. As you'd suspect, the loaned books can be read using the e-reader itself or the free Kindle app for any of your various devices (including iOS, BlackBerry, Android, PC, and Mac). While a book is being borrowed you can't read it yourself, and the publisher has the final word on which titles are eligible for lending. Exciting, right? At least as exciting as the opportunity to finally discover what The Secret Life of Bees might be.