“Children's Books Online: the Rosetta Project is the largest collection of illustrated antique children's books on-line.”
Story pages are jpegs ... so, easy to put into presentation-type display (i.e., powerpoint, prezi, screen-o-matic, etc.). If you want to download
the whole book, you need to pay whatever it costs.
Books with Audio
Books indexed by Age/Interest/Reading Level
Books in Multiple Languages
A Super Index of Books Online