DistroWatch.com: Put the fun back into computing. Use Linux, BSD.

http://www.distrowatch.com

Linux Distributions Guide

http://www.rodsbooks.com/distribs/

LinuxISO.org - A place to learn about, download, and discuss Linux.

http://www.linuxiso.org

Linux Online

http://www.linux.org/apps/

LinuxQuestions.org

http://www.linuxquestions.org/

Loads of Linux Links

http://loll.sourceforge.net/

The table of equivalents / replacements / analogs of Windows software in Linux

http://www.linuxrsp.ru/win-lin-soft/

Unix History

http://www.levenez.com/unix/http://acfwiki.pbwiki.com/forgot.php

timeline; List of Unix OS; UNIX links

Knowing Knoppix

http://www.pjls16812.pwp.blueyonder.co.uk/knowing-knoppix/

The first guide to Knoppix for the complete beginner

learn UNIX in 10 minutes

http://freeengineer.org/learnUNIXin10minutes.html

the basics commands for getting started using the UNIX shell

Linux Tutorial

http://www.lowfatlinux.com/

A tutorial for people who want to learn the basics of using Linux without getting bogged down in too much detail or technobabble.

FrozenTech's LiveCD List

http://www.frozentech.com/content/livecd.php

LinuxPrinting.org

http://www.linuxprinting.org/

"resources to help with printing under free operating systems like GNU/Linux and the BSDs or under commercial UNIX-like systems such as Solaris and OS X."