Book Giveaway

One of the things that I started doing when I moved my blog to my own domain name was book reviews.  I have only done a handful so far but I plan to do many more.  In fact, I have several books in my “to read” stack that have been sent to me by companies so that I can read them and review them.  The first company that asked to send me one also wanted to send me some extra copies so that I could do a book giveaway on here.  I have not done any giveaways in the past and am curious to hear from those of you who have what your favorite method is in order to do that.  What has worked best?  Have you figured out things to avoid doing?  Any ideas or suggestions would be appreciated!  Tthe giveaway will begin soon!