There are lots of books on faith and work. Most of them contribute something, but most of them are somewhat theoretical, or focus on a particular aspect (ethics, vocation, etc), or are only tangentially biblical. Not so Tim Keller's "Every Good Endeavor".
As a businessman with a passion for living out Christian faith as someone created in God's image, someone called by Him to work, I have longed for support from the church. I've blogged quite a bit about this but clearly don't have the time, staying power, or writing ability to write the book that could form the foundation of church ministry in support of ordinary people doing ordinary work in an extraordinary Kingdom way. Fortunately, Keller has all of the necessary attributes.
This book gives an engaging, Biblical view of God's intent for work. It is full of relevant (rather than merely entertaining) stories that bring home the principles. You will find it to be pragmatic and realistic - this isn't easy stuff to live out - but also full of hope and inspiration. I'm convinced no Christian could read this book and fail to come out with a higher, more meaningful understanding of their work, no matter what it is.
If you're going to buy just one book on faith and work (and I've bought quite a few), then buy this one.