WTSBooks is running a special on some excellent new resources from 9Marks. Anyone interested in the health of the church, elders, pastors, and ministry leaders particularly would benefit from these resources.
First, there are the 9Marks "Building Healthy Churches" booklets. These are brief books each explaining a particular area of church health. Highly recommended.
Second are the "Healthy Church Study Guides" also from 9Marks. These are designed for group study and would be very helpful for Christians seeking to have a deeper understanding of what the church is and why it exists. Highly recommended.