The Essential Guide to Healing: Equipping all Christians to Pray for the Sick by Bill Johnson & Randy Clark
I especially liked the stories in this book including the personal journey of Bill and Randy. The case built for healing and the gifts of the Spirit in the section A Theology of Healing is absolutely essential that the Christian understand and believe lest they become an unbelieving believer.
The practical section of the book called The Practice of Healing is so useful for those who want to know how to pray for the sick.
The relational five-step prayer model is especially helpful as a template for healing prayer.