"Technology makes stealing easy, but it makes sharing just as easy. The Creative Commons will let your students innovate in and out of the classroom without having to worry about copyright violations. "
Most of the media in these collections are attached to generous copyright licensing. Though you may not need to ask permission to use them when publishing on the Web for educational purposes, you should cite or attribute these images to their creators unless otherwise notified!
This site from the Library of Congress is an online portal of free reading resources for children, teens and adults. It features online versions of out-of-copyright books. (Mother Goose, Arabian Nights, etc.)
It also features webcasts of authors, writing contests, etc.
The teaching resources include lesson plans etc.