Suffering and the Goodness of God edited by Christopher Morgan and Robert Peterson;
Evil and the Justice of God by N.T. Wright;
The Problem of Pain by C.S. Lewis;
Suffering and the Sovereignty of God edited by John Piper and Justin Taylor;
How Long, O Lord? by D.A. Carson; and
Disappointment with God by Philip Yancey.
Any suggestions for other books that have been helpful?