http://cervantesvirtual.com/  
The definitive site for Cervantes including all works and audio reading of Don Quixote complete and free.

http://cervantesvirtual.com/portal/Platero/
Wide selection of children's literature. Interlingua will record a number of titles contained on this site in 2006.

http://www.fln.vcu.edu/menu.html
Good selection of literature including children's literature with English translations.