One of the best ways readers can help an author get their work noticed is by rating and/or leaving a review. As mentioned in a previous blog post Amazon.com is the king of the on-line book stores. If a book is listed on Amazon, there is no better place to leave a review and rating. While many people have tried (and failed) to understand the way that Amazon's algorithm's work, it would seem that books with a higher number of reviews rate higher and show up better when searched. Reviews are especially important when a book is newly released - there is nothing more lonely than seeing a book up with no ratings or reviews.
So next time you enjoy a book, take a moment to rate/review it and maybe give it a plug on your facebook/twitter page. Believe me the author will appreciate the effort.