This is a list of books that have greatly impacted me and I HIGHLY recommend everybody read at least once:
Christian Theology and Ethics
The Moral Vison of the New Testament: A Contemporary Introduction to New Testament Ethics (Richard B. Hays)
The Politics of Jesus (John Howard Yoder)
Good News and Good Works: A Theology for the Whole Gospel (Ronald J. Sider)
Biography
The Autobiography of Malcolm X (Alex Haley)
The Life of Mahatma Gandhi (Louis Fischer)
Long Walk to Freedom (Nelson Mandela)
The Narrative of the Life of Frederick Douglass, an American Slave (Frederick Douglass)
Gandhi An Autobiography: The Story of My Experiments with Truth (Mohandas K. Gandhi)
Cultural Issues/Studies
Myths America Lives By (Richard T. Hughes)
There Are No Children Here: The Story of Two Boys Growing Up In the Other America (Alex Kotlowitz)
War is a Force That Gives Us Meaning (Chris Hedges)
Amazing Grace: The Lives of Children and the Conscience of a Nation (Jonathan Kozol)
God’s Politics: Why the Right Gets it Wrong and the Left Doesn’t Get It (Jim Wallis)
History
Myths America Lives By (Richard T. Hughes)
People’s History of the United States: 1492-Present (Howard Zinn)
Nonviolence: Twenty-Five Lessons From the History of a Dangerous Idea (Mark Kurlansky)
Scripture Studies
The Moral Vison of the New Testament: A Contemporary Introduction to New Testament Ethics (Richard B. Hays)
The New Testament and the People of God: Christian Origins and the Question of God, Vol. 1 (N.T. Wright)
Jesus and the Victory of God: Christian Origins and the Question of God, Vol. 2 (N.T. Wright)
The Resurrection of the Son of God: Christian Origins and the Question of God, Vol. 3 (N.T. Wright)
The Challenge of Jesus: Rediscovering Who Jesus Was and Is (N.T. Wright)
Parables as Subversive Speech: Jesus as Pedagogue of the Oppressed (William R. Herzog)
Christian Living/Discipleship
Strength to Love (Martin Luther King, Jr.)
Mere Discipleship: Radical Christianity in a Rebellious World (Lee C. Camp)
No Greater Love (Mother Teresa)
Rich Christians in an Age of Hunger: Moving From Affluence to Generosity (Ronald J. Sider)
>The Cost of Discipleship (Dietrich Bonhoeffer)
The Irresistible Revolution: Living as an Ordinary Radical (Shane Claiborne)
Christian Leadership
The Wounded Healer (Henri J.M. Nouwen)
In the Name of Jesus: Reflections on Christian Leadership (Henri J.M. Nowen)
A Little Exercise for Young Theologians (Helmut Thielicke)
The Prophetic Imagination (Walter Brueggeman)
Ministry Resources
Creative Ministry (Henri J.M. Nouwen)
Life Together: The Classic Exploration of Faith in Community (Dietrich Bonhoeffer)
Spirituality
The Practice of the Presence of God (Brother Lawrence)
The Way of the Heart: Connecting with God Through Prayer, Wisdom, and Silence (Henri J.M. Nouwen)
Miscellaneous
A Testament of Hope: The Essential Writing and Speeches of Martin Luther King Jr. (Martin Luther King, Jr.; James M. Washington)
The Essential Gandhi: An Anthology of His Writings on His Life, Work, and Ideas (Mahatma Gandhi)
