I agree with anomie
I opened it for the first time a few minutes ago. The first thing you read on every chapter: "FreeBSD uses..." "In FreeBSD..." "... on FreeBSD". I think it's ok to show the examples only for FreeBSD but after all in this case the books title is not very well chosen. Even if the author states "Most of the features described in this book will work equally well in FreeBSD, NetBSD, OpenBSD, and other BSD Systems".
Every example console output is FreeBSD and not even the name "wd" for OpenBSD hard drives is mentioned.
There are a few nice examples and explanations of commands but the book really should be titled "FreeBSD Toolbox".
"Online Resources" Forums:
bsdforums.org
bsdnexus.com
freebsdwiki.net