Dad, this post is for you! Here is a list of online books and downloads for Kindle and other online reading. Many will also work with itouch and internet explorer.
Head here to the Amazon site and type in kindle store and then head to kindle books. Sort your list with the lowest price first and you will find several completely free readable books. These evidently change each month so you can try new books for free downloads.
Christian Audio is currently offering a free audio download of E.M. Bounds: Man of Prayer by Lyle Dorsett. Add it to your cart and then use coupon code MAYPRAY when you head to the checkout. This offer is available through May 31, 2010. (thanks moneysavingmom.com)
Prefer the old classics? Head over here for some classic books for free audio downloads. Including, White Fang, the King James Bible, Pilgrim's Progress, Legend of Sleepy Hollow and MANY others.