I've long been an admirer of Dale Ralph Davis. His books of sermons on Joshua - 2 Kings are models of what Christian preaching on the historical OT books can be. This book contains 12 of his sermons on the Psalms - specifically Psalms 1-12.
As you'd expect from DRD, each contains his own translation of the Psalm and a discussion of some of the textual and contextual issues, but only where they are relevant to the points he is making. The translations alone were worth the cost of the book, but I found the sermons moving, helpful, and they really pointed me to Christ.
Well worth reading devotionally, as I did. Well worth having if you are going to preach on any of the Psalms in the near future. Well worth studying to get ideas for how to preach poetry. Brilliant book.