Here are some what I have found to be some good books to read if you are a beginner and also a Mac user.

 Mac OS X (thats ten not ex as some people say) The Missing manual, Tiger Edition. by David Pogue.

There are some intresting infomation on how to use the Mac and also some (little history) ranges the new features such as spotlight (as I heard the new windows will not include) to the Dashboard. and also covers a little about the terminal (bash- mac chosen shell).

Unix for Mac OS Tiger by Dave Taylor.

I found this book very useful , easy to read and a very good layout and goes thou the basics of UNIX and also mentions some editing programs for UNIX as well. best book I have bourght so for for Mac and UNIX.

UNIX in a Nutshell 3rd Edition by Arnold Robbins.

This book is not really for beginners , sure it goes thou a lot of UNIX commands but it is only for reference only it is not meant to be read from start to finish , suitable for meduim to advanced users. Still a decent book for reference.