e-books for iPod touch

I have noticed that there are quite a few 4th and 5th grade students that have an iPod touch.  This is a great platform for viewing e-books.  Most of you may not be aware that many of our favorite children books are now in electronic form.  Tumblebooks.com now has an application for the iPhone, iPod touch, and iPad.  This application lets users read hundreds of books online from their Tumblebook library.  Apple's iTunes bookstore, and Amazon.com, also have a growing number of children's books that can be downloaded to your device.