One of the highlights of my studies at Western Seminary has been the course on Biblical Theology. One of the best resources from that course was the New Dictionary of Biblical Theology.
Such a great work! This dictionary has three main sections. The first is composed of several articles and essays on the understanding, use, and place of biblical theology. The second section walks through the various parts/books of the bible, and the content found therein. The third section develops biblical themes.
The themes section is especially helpful in getting some wide angle views on themes presented in scripture. This book is really helpful if you are interested in getting to know the material of the Christian scriptures better. Specifically how the different books relate to each other.