Old Testament Theology by Ollenburger edits a large volume illustrating the theological approaches to the OT of a wide range of scholars in the history of the discipline. The vast majority of articles are penned by liberal scholars, though Ollenburger does include excerpts of Walter Kaiser, Paul House, and John Sailhamer.
Old Testament Theology by Hasel analyzes issues and trends in Old Testament theology. He provides an extensive bibliography.
Introduction to Old Testament Theology by Sailhamer lays out his canonical approach to Old Testament Theology. The book focuses on methodology.
A Biblical-Theological Introduction to the Old Testament by Here's a book-by-book theology of the Old Testament by Willem VanGemeren, Mark Futato, Miles Van Pelt, Richard Belcher, and others.
Dominion and Dynasty by Dempster convincingly argues for the structural and conceptual unity of the Old Testament, demonstrating a clear overarching storyline. For more books in this excellent series, click the NSBT link under the "Book Series" tab.
Old Testament Theology by After writing on methodology, House employs a book-by-book approach to the Old Testament.
Toward an Old Testament Theology by This OT theology is also expanded in Kaiser's whole-Bible theology (The Promise-Plan of God) under the "General Resources" tab.
Everlasting Dominion by Merrill's magnum opus presents OT theology in five parts: God, mankind, God's kingdom, the prophets, and human reflections on God's ways (poetic books).
An Old Testament Theology by Waltke opens his book with chapters on the methodology of BT, then surveys the historical storyline of the OT, and concludes with chapters on the prophetic and poetic books.
Covenant and Creation (Revised 2013) by Dumbrell's significant book on Old Testament covenant theology (1986) is now revised (2013).
Against the Gods by Did the writers of Scripture borrow ideas from their cultural neighbors? What is the relationship between the Old Testament and ancient Near Eastern mythology? Currid examines the evidence, arguing that the Old Testament is highly polemical as he stresses differentiation over continuity.