The books are great, but they can get pretty pricey if you need more than one. What I would suggest is going on the websites for professional wedding photographers. They always have some of their portfolio on display for advertising purposes. When you see a shot that catches your eye, make a note of what made it good. I do this for modeling photography quite often. I may spend an hour cruising the net, but I will come out with 15-20 solid poses that I feel comfortable using.