We Give Books - sign up for a free account to access quality titles and authors. It is made by the non-profit branch of Penguin Books. Great reads for all ages! Lots of non-fiction!
Barnes and Noble Online Storytime - great books, like The Very Hungry Catepillar, read by the author.
Storyline Online - celebrities read popular titles with sound effects and music
Scholastic Listen and Read Online Nonfiction Books
One More Story - sign up for a free trial