The following is a list of good books to add to your library. You can find them at the Christian Book Store website (cbd.com) or at Amazon.com.
What I'm Currently Reading
Jonathan Edwards, Iain Murray
Knowing God, J. I. Packer
1-2 Peter, RC Sproul
Essential Reading
Desiring God, John Piper
God is the Gospel, John Piper
Redemption Accomplished and Applied, John Murray
The Gospel According to Jesus, John MacArthur
Worship Matters, Bob Kauflin
Theology
Systematic Theology, Wayne Grudem
The Christian Faith, Michael Horton
The Difficult Doctrine of the Love of God, D. A. Carson
Who Needs Theology? An Invitation for the Study of God, Stanley Grenz & Roger Olson
Spurgeon v. Hyper-Calvinism; The Battle for Gospel Preaching, Iain H. Murray
Christian History
The Story of Christianity Vol 1 & 2, Justo Gonzalez
Christian Living
Worldliness, C.J. Mahaney
Love Your God With All Your Mind, J.P. Moreland
The Peacemaker, Ken Sande
The Cost of Discipleship, Dietrich Bonhoeffer
A Quest for Godliness, J.I. Packer
Fresh Wind Fresh Fire, Jim Cymbala
God's Passion for His Glory, John Piper
The Bible and Bible Study
Living by the Book, Howard & William Hendricks
How to Read the Bible for all its Worth, Gordon Fee & Douglas Stuart
Inerrancy, Norman Geisler
Parenting
Shepherding a Child's Heart, Tedd Tripp
Instructing a Child's Heart, Tedd & Margy Tripp
Everyday Talk; Talking Freely and Naturally about God with your Children, John Younts
Building Strong Families, Dennies Rainey(editor)
Excused Absence, Douglas Wilson
Marriage & Relationships
I Kissed Dating Goodbye, Joshua Harris
This Momentary Marriage, John Piper
Apologetics
The Reason for God, Timothy Keller
Christian Biography
Here I Stand, Roland Bainton (Life of Martin Luther)
Portrait of Calvin, T.H.L Parker
John Calvin--A Biography, T.H.L Parker
William Tyndale: A Biography, David Daniell
The Legacy of Sovereign Joy: God's Triumphant Grace in the Lives of Augustine, Luther, and Calvin (The Swans Are Not Silent), John Piper
The Roots of Endurance: Invincible Perseverance in the Lives of John Newton, Charles Simeon, and William Wilberforce (Swans Are Not Silent), John Piper
The Hidden Smile of God: The Fruit of Affliction in the Lives of John Bunyan, William Cowper, and David Brainerd (The Swans Are Not Silent), John Piper
Contending for Our All: Defending Truth and Treasuring Christ in the Lives of Athanasius, John Owen, and J. Gresham Machen (The Swans Are Not Silent), John Piper
Filling Up the Afflictions of Christ: The Cost of Bringing the Gospel to the Nations in the Lives of William Tyndale, Adoniram Judson, and John Paton (The Swans Are Not Silent), John Piper
Worship
Worship Matters, Bob Kauflin
Worship by the Book, D.A. Carson(editor)
Shepherding
Preaching & Preachers, D. Martyn Lloyd-Jones
Feed My Sheep, Various Contributors
The Reformed Pastor, Richard Baxter
Brothers We are not Professionals, John Piper
Biblical Eldership: An Urgent Call to Restore Biblical Church Leadership, Alexander Strauch
Evangelism
Let the Nations Be Glad!, John Piper
Evangelism and the Sovereignty of God, J.I. Packer
The Gospel & Personal Evangelism, Mark Dever
Devotional Reading
For the Love of God, D.A. Carson
The Valley of Vision, A collection of Puritan Prayers & Devotions
Taste and See, John Piper
Pilgrim's Progress, John Bunyan