Amazon.com offers many free Kindle ebooks. (You do not need to own a Kindle to read Kindle ebooks. You can use one of the many free Kindle apps.) Some of the free Kindle ebooks are classics in the public domain, such as novels by Jane Austen, Arthur Conan Doyle and others. However, some publishers also choose to make Kindle editions of recently-released books available free for a limited time. You can find these limited promotional offers in the Kindle store at Amazon.
Right now, Amazon has several books of interest to writers available free in the Kindle store. They will not be free forever, so go download them right away. Here is a list of the free Kindle ebooks for writers that I found today (November 8, 2011):
Add these ebooks to your collection now, while they are available at no cost, then use them to become a better, more successful writer. After reading these books, you may want to add others from these authors to your library or purchase the print versions to keep handy for reference. Enjoy!