First you have to find the companies that will send you the free books in exchange for writing a review about the book once you are finished reading it. The following publishing companies are currently looking for book review bloggers, to sign up to become one and start getting free books all you have to do is fill out the information on their web site.
Thomas Nelson Publishing Company: www.brb.thomasnelson.com
Bethany House Publishers: http://www.bethanyhouse.com/ME2/Audiences/dirmod.asp?sid=&type=gen&mod=Core+Pages&gid=9105336A40704DC8ABCEF29DF7C1DC2C&AudID=205F4A61B07648D98551934CA40DE116
After you sign up for their program they will mail you a book once you choose which one you would like to read from their selection. After you receive the book in the mail you are expected to fully read the book and write a short review about what you thought of the book. You should then post your review to your blog and a retail book web site like Barnes & Noble or Amazon.
Once you are finished posting the review to the sites you will have to notify the publishing company on their web site or through e-mail to show that you have wrote the review and posted it. Once you submit the links to the web sites that have your review posted on them you can then request another book to be mailed to you. All the books the publishing company sends to you are yours to keep free of charge. All they ask in return is that you write a review on each book. This is a great way to continuously get new free books to read.