"Before reading Greg Lehey's "The Complete FreeBSD, 4th Ed" (TCF:4E), I reviewed Michael Lucas' excellent "Absolute BSD" (a FreeBSD book) in Feb 03. I can't say which book is better, and I recommend you buy Lucas' book as well as this one. TCF:4E remains for me the FreeBSD user's manual; any serious FreeBSD user will have it on his or her shelf. The two books complement each other, as Lucas is often more direct in his explanations."
I submitted my five star review of Michael Lucas' Absolute OpenBSD last night. We'll see how long it takes to appear!