The Preaching Classic Texts series helps preachers understand biblical texts in light of current scholarship. Each volume gives exegetical help, suggestions on how to preach important biblical texts, and sample sermons.
Most of the book is not really about preaching. It is an interesting analysis of Job, taking one through the entire book. There is a brief part specifically about preaching, but it does give me as bunch as I really would like to have on the subject. I'm not that interested in sample sermons.