I know this is a rather old thread, but I just wanted to add that I often use the regular BSD manuals to help me understand what I am doing in PC-BSD. In my opinion, the most important (and helpful) books on the subject are Michael Lucas' Absolute FreeBSD and Absolute OpenBSD . These are great books by No Starch Press and you can scribble in the current (or most favorite) commands in the margin and soon you will have a "current" book on BSD (that also applies to much of PC-BSD).
I think "current" is relative. I still get great help from Marshal McKusik's The Design and Implementation of the 4.3BSD UNIX Operating System.
To me, the importance of a conceptual understanding can't be beat. Thus the Lucas books are well-written, friendly and helpful as is Lehey's The Complete FreeBSD. I tend to use the command line for everything, anyway. Just my opinion. Lucas seems to advocate compiling packages rather than installing binaries and that is what he teaches. He also seems to prefer compiling his updates (rather than using a binary update method like freebsd-update)
Last edited by rich4421972; 03-03-2013 at 03:17 PM.