Write and post a review (even a short "I really enjoyed this book! Can't wait for the next book in the series." works well) on Amazon.com, Barnesandnoble.com, and/or Goodreads.
Review or mention the book on your Facebook page, blog, or Twitter. Feel free to include a book cover image (you can copy one from the author website or an online bookstore site.)
Ask your local library to order the book. It's a good idea to have the book's ISBN number with you when you make the request. You can find the book's ISBN number on the book's Amazon or Barnes and Noble page online.
Recommend the book to your book club.
Order extra copies as gifts for friends and family.
Sign up for newsletters and purchase the author's next book.
Thanks so much to all my readers. I couldn't do it without you!