Why Revival Tarries - Leonard Ravenhill - A book about prayer, preaching, and revival.
The Cross and the Switchblade - David Wilkerson. - A testimony to the power of the baptism of the Holy Spirit, and the founding of the "Teen Challenge" program beginning in New York.
Fresh Wind, Fresh Fire - Jim Cymbala (all 3 books in the series) - The need for us as a church to get back to the basics.
Apostolic Foundations - Art Katz - This book is about living out the realities of our faith in a way that can be called "apostolic."
Road to Reality - K. P. Yohannan - A book that will cause you to live your life with your eyes on eternity. It's ultimately a call to live a more simple life.
No Compromise: The Life Story of Keith Green - Melody Green. It's an amazing thing what God can do in such a short time through one man. Some have called Keith Green "John the Baptist on a Piano."
The Charismatic Theology of St. Luke - Roger Stronstad - The greatest scholarly defense ever put forth concerning the baptism of the Holy Spirit being essentially a post-conversion experience.
Selling out the Church - Philip D. Kenneson - A book that absolutely shatters the buyer/consumer mentality of the way we do church.
Life on the Vine - Philip D. Kenneson - A very close examination of the fruit of the Spirit as outlined in Galatians 5, and it's practical application.
The Open Church - James Rutz - Examines how the early church met in the Scriptures, namely, in an open participatory meeting where everybody could contribute. Also examines some churches (even large ones) that meet in this format today. A bit cheesy sometimes in writing style, but still a valuable read.
The Sermons of John Wesley - You can find these online or in various volumes that have been compiled. They are well worth a series read.
Also, for commentaries I generally recommend volumes from the series, The New International Commentaries (NICOT and NICNT respectively for each testament).
I've read many other good books, but these are by far the one's that stick out most in my mind.