The Fink coverage, as with OS X for Unix Geeks, is too light. This is an important utility for those that want to use OS X as a Unix machine and it deserves more coverage than it got.
Overall the book is a good introduction and reference, but it is light on opinion. There are lots of ways to work and to organize stuff in Unix flavored operating systems and the book gives little in the way of advice or opinion. Which is sad, but not unusual. I can't penalize the book for that though. I just wish that more technical books would state opinions from experience.