The Age of Innocence - Etext at Project Gutenberg. - http://www.gutenberg.org/etext/541
ClassicNotes: Age of Innocence - Chapter summaries, list of characters, biography of the author. - http://www.gradesaver.com/ClassicNotes/Titles/ageinnocence/
eBooks Cube: The Age of Innocence - The complete free book in HTML format. - http://www.ebooks3.com/ebooks/the_age_of_innocence.html
Literature Network: The Age of Innocence - Chapter indexed HTML of the complete text. Includes a search feature and author biography. - http://www.online-literature.com/wharton/innocence/