WordWeaver just found a wonderful website where you can go to download audio books for free! They are all in the public domain which means there's no copyright on them so they are fair game.
Go to librivox
You can browse their catalog for titles you'd like to hear. Many are adult books but there is a good number of children's classics such as ALICE'S ADVENTURES IN WONDERLAND by Lewis Carroll, ANNE OF GREEN GABLES by L.M. Montgomery; ANDERSEN'S FAIRY TALES by Hans Christian Andersen; BLACK BEAUTY,THE AUTOBIOGRAPHY OF A HORSE by Anna Sewell; TREASURE ISLAND by Robert Louis Stevenson and more.
Follow the directions for listening to your favorite book and enjoy!