The International Children's Digital Library is a fascinating project, whose intent is to make accessible to children from all over the world samples of children's literature. Thousands of children's books have been digitized and posted to their website in this way.
What is even more interesting about this website, is the fact that extensive studies and workshops were conducted in its design, in which researchers worked closely with young children to determine an interface that best suited a child's particular interests and searching needs.
For example, many children reported that they liked picking books based on the color of the cover, or whether the content could be named "happy" or "sad", and so these are filtering options available to browsers of the website.
As an example of what goes on at the International Children's Digital Library, I give you a classic tale: The Pied Piper, as written by Robert Browning. Obviously a digital copy of a very old version of the book.