Literature.org – The Online Literature Library

Free e-books are available from them only for authors who have been dead for 75-90 years, due to copyright restrictions. Here is a list of their current authors:

* Aesop
* Louisa May Alcott
* James Matthew Barrie
* L. Frank Baum
* Anne Bronte
* Charlotte Bronte
* Emily Bronte
* Edgar Rice Burroughs
* Lewis Carroll
* Willa Cather
* Wilkie Collins
* Stephen Crane
* Charles Darwin
* Honore de Balzac
* Daniel Defoe
* Rene Descartes
* Charles Dickens
* Arthur Conan Doyle
* Fyodor Dostoevsky
* Alexandre Dumas
* George Eliot
* Mary Ann Evans
* Thomas Hobbes
* Marietta Holley
* Thomas Hughes
* William Kemp
* D. H. Lawrence
* Jack London
* John Milton
* Lucy Maud Montgomery
* E. Nesbit
* E. Phillips Oppenheim
* Edgar Allan Poe
* Mary Shelley
* Bram Stoker
* Leo Tolstoy
* Mark Twain
* Jules Verne
* Voltaire

There are some other sites that offer similar books as these are all in the public domain, but this is quite a nice format