Erhard S. Gerstenberger 
Theologies in the Old Testament [PDF ebook] 

The author here offers a radical departure from traditional treatments of Old Testament theology. Rather than offering a systematic approach, he discusses the various theological voices coming from different social settings within ancient Israel: the family and the clan, village, tribal alliance, and kingdom. Gerstenberger concludes with his reflections on how the biblical witness informs contemporary theology, and must be contextual and ecumenical in order to be authentic.