Search the HathiTrust Database of eBooks
Includes titles from Google's book digitization program. Books that are available to all are listed as "Full View". If you search for a topic or book, you have the option of refining your search with "Full-Text" on the results bar on the left of the page. There are a number of eBooks available in this way. (If you find any gems, let the rest of us know!)
Voyages of Dr Doolittle
The tailor of Gloucester, by Beatrix Potter
Japanese fairy tales, by Lafcadio Hearn and others.