Until now there was almost no book about KVM in English. This lack is fulfilled.
Three people, working for Red Hat, have published a book called Mastering KVM Virtualization in August and this book provides an extensive coverage of this technology.
So, you will learn the basic stuff like the various ways to set up the network and the storage parts. But you will also get best practices, some performance tuning tips or some advanced configurations with OpenVswitch and oVirt.
This book is the new reference on this topic.