Dr. Paul Chung has just co-authored a book on Lutheran theology in the public sphere: Liberating Lutheran Theology. Here's a brief description:
Lutheran theology of freedom at the center of grace of justification may become an arbiter for contextualizing God's grace and human discipleship in the public sphere.
This volume includes three different Lutheran perspectives as represented by European Lutheran theology (Ulrich Duchrow), American Lutheran theology (Craig L. Nessan), and Asian Lutheran theology …

Last month Dr. Dwight Zscheile gave an excellent brief overview of his new book, authored jointly with Dr. Craig Van Gelder, The Missional Church in Perspective: Mapping Trends and Shaping the Conversation.
The book will be published in Spring 2011, and in the meantime Dr. Zscheile has agreed to post his powerpoint slides here.