Here is a great book about SCRUM (unfortunately in French so far) :
SCRUM : Le guide pratique de la méthode agile la plus populaire
(or amazon).
The great thing is that the author (Claude AUBRY) gave us his feedbacks and returned of experiments about SCRUM.
As a Product Owner of "IceScrum" (OpenSource), he also tells us how to use it; the only drawback so far is that he does not presents other tools.
Great value either for beginners willing to improve their knowledge or for confirmed SCRUM practitioner.
Thanks.