There's a great interview with Dr. David Baggett and Dr. Jerry Walls by Joseph E. Gorra available at the blog of the Evangelical Philosophical Society. Gorra's interview allows Walls and Baggett to go a little deeper on certain topics and explain the motivation of some of the positions taken in Good God. Gorra asks some great questions about the overall approach of the book, the objection to Calvinism, and the role of natural law, among other things. It's well worth the read. You can find the interview here.