This week we installed our first Linux Server. It’s a CentOS box that is being used as a Web Development Server in-house. Our Production Server will be a RedHat box Dedicated Server hosted offsite. So far so good. We have a few volunteers that are great with Linux who helped with the installation and on going support. I am interested in learning as much as I can, since I am ultimately responsible for the server.
All you Linux users, post some “must have” or “must know” comments that will help with managing and maintenance of this new server. I’m all ears (or “all eyes” I guess I should say, since I’ll be “reading” them) 
* Samba for file-sharing is a good system to get working
* I like to do email filtering with MimeDefang and SpamAssassin
* Asterisk is a neat app: http://itdiscuss.org/asterisk
* The free VMware Server is excellent: http://itdiscuss.org/vmware
* Then you should also check out Ubuntu distro: http://itdiscuss.org/twiki/bin/view/Main/UbuntuLinux
* Squid Proxy Server will speed up your Internet access: http://www.deckle.co.za/squid-users-guide/Terminology_and_Technologies