This is a part of a reading list I found on Redeemer Pres.' website recently. If you can find the time, I would certainly encourage anyone to pick up a few of these titles.
Michael Horton
Putting the Amazing Back into Grace
Harvey Conn
Evangelism: Doing Justice and Preaching Grace
(This one is excellent!)
J.I. Packer
"Introduction" to J.Owen's The Death of Death
Jonathan Edwards
On the Religious Affections
Martin Luther
"Preface" to Commentary on the Epistle to the Galatians
(Just read this yesterday. A pivotal work.)
Dick Keyes
Chameleon Christianity