[As of Mar 2009, Lookybook is no longer active.]
Elementary teacher-librarians will love this site I stumbled across: LookyBook. What's so great about this resource is you can use it to preview a title, or allow kids to re-read at home a book you've presented in the library. You can even embed your favs on your own webpage. See the sample below! (Clicking on the orange eyeglasses will take you to their site. )
