Good overview of the wedding photography business, so far as I can tell. As the title would indicate, the author speaks from the digital perspective, thereby allowing him to better concentrate on one of two camps. He walks through all the aspects of the business I could think to want from a book like this...he talks about equipment, what kind of shots you want to be sure to get, considerations to be made in getting those shots, the business side of the operation, even suggestions for setting up an office (down to wall color, which is something I hadn't thought of but can see why it would be important).
Overall, if you're looking to get into this business, I think this book is an excellent place to begin.