Book on how Linux works from an administrator's point of view?

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http://unix.stackexchange.com – I did find this book, but I was wondering whether there's a newer book on the market, because this one was released in 2004. I'm sure a lot has changed in the past 7 years? I need a book that helps me understand linux, instead of just giving me console recipes to reach certain goals. I need an overview picture of all its important components and how they work together, without going too much into kernel internals. Any help would be appreciated on finding an appropriate book for an administrator who is interested in this wonderful OS called Linux. I'm not a newbie to Linux, I just want to ge (HowTos)