The program works like this. You pick one of the books from their catalog and they will ship you a complimentary copy of that book for free. In return, you’ll have to post a review of that book on your blog and on Amazon.com or another online bookstore such as Barnes & Noble, Borders or Wal-Mart.
Once you are done with the review, you can keep that book and request another book to review from Thomas Nelson.
For more information : A Book Review Program for Bloggers