Comment on the books we review or add reviews of your own.
In the context of what Jamie.R has asked for, this is a good resource for securing Linux from an Administrator's perspective.
http://www.amazon.co.uk/Hacking-Exposed ... 0072262575
However, from the reviews in the above link, those more interested in a hackers perspective would probably find the second edition more useful.
A good free resource is the Debian Administrator's handbook:
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