Luther's Small Catechism Annotated by Edw. W. A. Koehler
  Koehler's annotations are very helpful in understanding basic Lutheran teachings.
In the Fullness of Time : A Historian Looks at Christmas, Easter and the Early Church
  by Paul L. Maier
  Excellent for further understanding of the first Christmas, the first Easter, and the early Christian church.
Luther the Reformer
  by James M. Kittelson
  Balanced biography of Luther, easy to read.
Baptized into Gods Family
  by A. Andrew Das
  Good overview of Lutheran teachings concerning Baptism.
Proper Distinction Between Law and Gospel
  by C.F.W. Walther
  Critically important for proper testing of teaching and practice against the Scripturess.
Law and Gospel : the Foundation of Lutheran Ministry
  by Robert J. Koester
  Applies the proper division between Law and Gospel specifically to the church growth movement.
Church and Ministry
  by C.F.W. Walther, Translated by J.T. Miller
  Critical for understanding the Church and the Office of Public Ministry.
Sanctification, Christ in Action
  by Harold L. Senkbill
  Excellent study of the doctrine of sanctification
Here I Stand : A Life of Martin Luther
  by Roland H. Bainton
  Classic biography of Luther
Life Together: The Classic Exploration of Faith in Community
  by Dietrich Bonhoeffer
  Excellent examination of the life of Christians
What's Going on Among the Lutherans? : A Comparison of Beliefs
  by Patsy A. Leppien and J. Kincaid Smith
  Excellent comparison of teachings of our church with trends within American Lutheranism
The Cost of Discipleship
  by Dietrich Bonhoefer
  Excellent for meditation on sanctification
Liberalism : Its Cause and Cure : The Poisoning of American Christianity and the Antidote
  by Gregory L. Jackson
  Examines influences and stresses upon the church body
Ministry, Word and Sacraments : An Enchiridion
  by Martin Chemnitz
  Question and answer format. Good testing of understanding and an excellent resource.
Two Natures in Christ
  by Martin Chemnitz
  Excellent work on the One Person and Two Natures of Christ
The Lord's Supper/De Coena Domini
  by Martin Chemnitz
  Worthy of consideration in today's discussions
The Hammer of God
  by Bo Giertz
  Fiction. Good for testing application of doctrine of Church and Ministry
Christian Faith : a Lutheran Expositionby Robert Kold
  Excellent overview of basic teachings. Easy to read.
Lutheran Worship : History and Practice
  Edited by Fred L. Precht
  Excellent for understanding our teachings concerning worship.
History of Theology
  by Bengt Hagglund, translated by Gene J. Lund
Confessional Lutheran Dogmatics - Vol VI : Christology
  by David P. Scaer
Confessional Lutheran Dogmatics - Vol IX : The Church and Her Fellowship, Ministry, and Governance
  by Kurt Marquart
Confessional Lutheran Dogmatics - Vol XI : Baptism
  by David P. Scaer - order through Logia Books