Other
Clockwatchers: Linux Tutorial
This online tutorial is provided for people with no Linux or Unix experience. It covers the basics, such as connecting, working with files and directories, changing a password, and using man.
Other
The Linux Documentation Project
This very complete Linux documentation site includes links to how-tos, guides, FAQs, man pages, the Linux Gazette, and Linux Focus.
Other
Mcmse.com: Linux Study Guide
This tutorials covers: Installation, Configuration, Administration, System Maintenance, Troubleshooting and System Hardware.