Encrypting your data is becoming increasingly important, but you don’t always have to use an encrypted filesystem. Sometimes just encrypting files is enough.
Regularly scanning the ports on your own network prevents intruders from sneaking in, but if you have dozens or hundreds of servers, you’ll need professional help: Dr. Portscan to the rescue.
Penetration Testing and security auditing are now part of every system administrator's "other duties as assigned." BackTrack Linux is a custom distribution designed for security testing for all skill levels from novice to expert.