This book is a great example of that. It comes complete with three CDs containing Red Hat Linux (which, I assume, are the same as or very similar to the three that come with Red Hat's own shrink-wrapped product) and it therefore starts with installing Red Hat Linux. However, some thousand or so pages later, the same book is talking about some really quite advanced systems administration tasks. I'm really not sure that the same audience will need both of those ends of the spectrum.