Open Library is a part of the Internet Archive. The Open Library is a collection of more than one million free ebook titles. The collection is cataloged by a community of volunteer online librarians. The ebooks in the Open Library can be read online, downloaded to your computer, read on Kindle and other ereader devices, and embedded into other sites. Some of the ebooks, like Treasure Island, can also be listened to through the Open Library.
Applications for Education
Much like Google Books, the Open Library could be a great place to find free copies of classic literature that you want to use in your classroom. The Open Library could also be a good place for students to find books that they want to read on their own. The audio option, while very electronic sounding, could be helpful if you cannot locate any other audio copies of the book you desire.
Update: shortly after I wrote this post, Open Library posted this message on their blog indicating that they are in the midst of a data center migration and that the site might not be fully functional for a day or two.