Note: These are not necessarily books published in 2008, but rather books I read or reread in 2008, that stick in my memory as notable in some way. I regret that I did not keep as good a record of books read as I usually do, which is unfortunate since I read more books this year than I have in previous years.
These are presented in no particular order.
When Sinners Say I Do (Dave Harvey) - An excellent book on marriage, among the best that I have read. It is good for all couples, whether with problems or without. I have used it for premarital counseling as well.
The Complete Husband (Lou Priolo) - An excellent book for husbands,complete with practical steps to be a godly husband. Men, just don't let your wife see it. She will raise her expectations.
Depression (Ed Welch) - Welch deals with this topic is a sensitive way, but loaded up with Scripture. This is neither a "get over it" book, nor a "get the meds" book. It deals with a tough topic in a biblical way that neither minimizes it nor glorifies it. (Though I didn't read it this year, I am reminded of Welch's Addictions: Banquet in a Grave. It is the best book I have read on life-dominating sins.)
Seeker Small Groups (Gary Poole) - From Willow Creek Resources, this is not a book about how to "do church" so to speak. It is a book about how to engage unbelievers in spiritual conversation with the goal of seeing them converted. This methodology fits well in any kind of church. If you are going to do "seeker" ministry, this is the way to do it.
Kingdom of Priests (Eugene Merrill) - An excellent history of OT Israel from an excellent writer and scholar. It contains a breadth of extra-biblical data that helps to place the biblical record in its historical context, while holding unashamedly to a high view of Scripture.
Toward an Exegetical Theology (Walter C. Kaiser) - An older volume, both worth rereading in terms of the exegetical process for preaching.
Cracking OT Codes (Brent Sandy and Ronald Geise) - A book on interpreting the various OT genres. Excellent for those who want to give more thought to how we should interpret the various literary genres in the OT Scriptures.
Turning the Tide (Nigel Cawthorne) - A recounting of the significant battles of World War II. It is a very fascinating overview, particularly of the Pacific Campaign. It is surprisingly poor in terms of publishing quality (numerous typos), but it is a good read. These types of books always provide me with a plethora of illustration ideas for preaching and teaching.
On Being a Pastor (Derek Prime and Alistair Begg) - I have picked this book up at the end of the year to reread it and am reminded again that it is an excellent book on the nuts and bolts of pastoral ministry.
Do I even need to say that inclusion in this list is not a blanket endorsement of the book itself, the author, the ministry of the author, anyone cited in the book, or all the theology of the book?