Helpful resources
There's a lot of great information out there if you know where to find it. If your reading isn't quite what you'd like it to be, Erik Raymond has some suggestions to help you read more. Here are some resources about Christianity that I've found helpful, or have had recommended to me:
The Bible
ESV Study Bible (review)
NIV Zondervan Study Bible
My guide to getting started with reading the Bible.
How To Read the Bible for All Its Worth, Gordon D. Fee, Douglas Stuart
Grasping God’s Word, J. Scott Duvall and J. Daniel Hays
The Bible in 100 Pages, Phil Moore
Why Trust the Bible?, Amy Orr-Ewing
New Bible Dictionary (published by IVP)
Recommended commentaries on each book of the Bible
Biography/History
John Newton: From Disgrace to Amazing Grace, Jonathan Aitken (review)
The Story of Christianity, David Bentley Hart (review)
The Passion That Shapes Nations, Charlie Cleverly
Bonhoeffer: Pastor, Martyr, Prophet, Spy, Eric Metaxas
A Life of Trust, George Müller (review)
The Unquenchable Flame, Michael Reeves
Awakening, David Robertson (quotes from)
Fierce Convictions: The Extraordinary Life of Hannah More, Karen Swallow Prior
A Retrospect, Hudson Taylor
The Hiding Place, Corrie Ten Boom (review)
Church
What On Earth is the Church For?, David Devenish
The Spirit-Filled Church, Terry Virgo
The Christian Life
Humble Roots, Hannah Anderson
The Rest of God, Mark Buchanan
Just Do Something, Kevin DeYoung (review)
Celebration of Discipline, Richard Foster (review)
More Than Conquerors, Simon Guillebaud
Humility, Andrew Murray
Desiring God, John Piper (abridged version: The Dangerous Duty of Delight)
You Are What You Love, James K.A. Smith
Sacred Pathways, Gary Thomas
The Pursuit of God, A.W. Tozer
God’s Lavish Grace, Terry Virgo
Death
A Grief Observed, C.S. Lewis
Explaining Christianity
The Reason for God, Timothy Keller
Making Sense of God, Timothy Keller
Why Trust the Bible?, Amy Orr-Ewing
If God, Then What?, Andrew Wilson
Fiction
Pride and Prejudice, Jane Austen
Jane Eyre, Charlotte Brontë
The Brothers Karamazov, Fyodor Dostoevsky
Peace Like A River, Leif Enger (review)
Gilead, Marilynne Robinson (review)
The Lord of The Rings, J.R.R. Tolkien
God
Reclaiming Adoption, ed. Dan Cruver
He Was And Is And Is To Come, Stefan Liston and Dan Jones (review)
Gagging Jesus, Phil Moore (review)
The Good God, Michael Reeves
Christ Our Life, Michael Reeves (review)
One Thing, Sam Storms
The Knowledge of the Holy, A.W. Tozer (review)
Incomparable, Andrew Wilson
Simply Jesus, Tom Wright
Holy Spirit
Fresh Wind, Fresh Fire, Jim Cymbala (review)
Surprised by the Power of the Spirit, Jack Deere
Surprised by the Voice of God, Jack Deere
Joy Unspeakable, D. Martyn Lloyd Jones (review)
Everyday Supernatural, Mike Pilavachi and Andy Croft
The Spirit-Filled Church, Terry Virgo
Leadership
The Making of a Leader, Robert Clinton
Sustainable Power, Simon Holley
Shepherds After My Own Heart, Timothy S. Laniak
Good To Grow, Steve Tibbert (review)
Prayer
Fresh Wind, Fresh Fire, Jim Cymbala (review)
The Prayer Course, Pete Greig
A Praying Life, Paul E. Miller (review)
Relationships
You and Me Forever, Francis & Lisa Chan
The Five Love Languages, Gary Chapman (review)
For Men Only and For Women Only, Shaunti & Jeff Feldhahn
The Meaning of Marriage, Timothy Keller
Marriage and the Mystery of the Gospel, Ray Ortlund
Twitter
If you're going to spend time there, here are some people who I think are good to follow.