Amazon Kindle - Amazon Kindle software lets you read ebooks on your Kindle, iPhone, iPad, PC, Mac, BlackBerry, and...
Project Gutenberg - Project Gutenberg offers free ebooks to download.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Standard Ebooks - Online library of downloadable e-books that focuses on quality and modern standards in typography.
Kindle Cloud Reader - Kindle Cloud Reader lets you read ebooks instantly in your web browser - no Kindle device required.
Forgotten Books - Forgotten Books is a gigantic online library with over 400,000 books.