If you are willing to search around the internet for the same info, you will most likely find it. I just don't have the time to do it.
That said, the book helped me a lot when dealing with certificates and the reason for TSL-Auth. I would have liked to have seen more diagrams and "cook book" examples. Overall it was worth the price to me, I really needed OpenVPN to work for my company and the book had just enough info to help me.
Again, I would like to see more advanced examples presented, like bridging multiple networks together.
Network administrators and any one who is interested in building secure VPNs using OpenVPN. It presumes basic knowledge of Linux, but no knowledge of VPNs is required. All basic VPN and relevant security concepts are covered.