Short Review: I think conceptually this is a very good book. Christianity does need to pay more attention to beauty. We often reduce beauty to sexuality. Here Zahnd is talking about conceptual beauty of ideas and actions and the mystery and wonder and awe that should be a part of Christianity. He is concerned that when Christianity loses its regard for beauty it means that it becomes a religion that is flat, focused on control and solving problems instead of following God. The central beautiful concept of the book is the cross.
The book dragged a bit and meandered a bit. So I think it could be tightened up, but on the whole I think the concepts are ones that should be discussed and talked about much more.
My full review is on my blog at http://bookwi.se/beauty-zahnd/