Fedora 9 and Red Hat Enterprise Linux bible / Christopher Negus, Wiley, 2008
Here are 1000 pages for the Fedora admin. It will be useful at the beginner and intermediate level. Most of it applies to any current Linux distro. It includes a live CD and an installation DVD.
Asterisk for dummies / by Stephen P. Olejniczak and Brad Kirby, Wiley, 2007
Here are 300 pages of very readable information on how to configure your VOIP server.
Creating the secure managed desktop : using Group Policy, SoftGrid, Microsoft Deployment Toolkit, and other management tools / Jeremy Moskowitz, Wiley, 2008
Here are 700 pages of very readable guidance to managing workstations in a business environment.
Google advertising tools / Harold Davis, O’Reilly, 2006
Here is a fascinating book on how to make advertising money from your web site. Some programming knowledge is required to make use of this book.
Linux firewalls : attack detection and response with iptables, psad, and fwsnort / by Michael Rash, No Starch Press, 2007
Here is a good introduction to iptables and related tools, with script examples. Make good use of this book, and there is a good chance you and your company will never get hacked.
Professional Apache Tomcat 6 / Vivek Chopra, Sing Li, Jeff Genender. Wiley 2007 ISBN: 9780471753612
This is the quickest way for a systems admin to understand Tomcat. There is a lot to learn, and you need to know it all.
This book is not for the Java J2EE programmers who develop the servlets and web applications. Neither is it for a Tomcat developer.