Slackware 

http://www.edafe.org/slackware/index.html

Default Runlevel 

/etc/inittab set the default runlevel for your installation:

# These are the default runlevels in Slackware:
# 0 = halt
# 1 = single user mode
# 2 = unused (but configured the same as runlevel 3)
# 3 = multiuser mode (default Slackware runlevel)
# 4 = X11 with KDM/GDM/XDM (session managers)
# 5 = unused (but configured the same as runlevel 3)
# 6 = reboot

# Default runlevel. (Do not set to 0 or 6)
id:4:initdefault:

Documentation 

Slackware Linux Basics
Daniel de Kok aims this up-to-date introduction to Slackware Linux 10.2 at "people who have little or no GNU/Linux experience". An excellent resource for those who are new to Slackware Linux. http://www.slackbasics.org
SlackTips
Mikhail Zotov illustrates how aliases and functions can help to speed up many everyday operations in bash. http://slackworld.berlios.de
The Stealth Desktop
"There is one distribution you would seldom hear about and yet, it is uniquely qualified for heavy-duty desktop usage". Eduardo Sanchez in a three part article on how to setup Slackware. http://www.ofb.biz/modules.php?name=News&file=article&sid=315
Slackware Linux 101
Joe Brockmeier explains how Slackware initialises services, what the various runlevels are and how to add or remove services from the default install. http://www.ibm.com/developerworks/linux/
Slackware 10.2 Tips
"Writing a tips article is tricky. Veteran users want incredibly good tips. New users want tips that bring accessibility and understanding to Slackware. Find that balance here." http://www.dualisanoob.com
Revised Slackware Book Project
Revised version of the Slackware Linux Essentials book available for reading online. http://www.slackbook.org

Help 

Slackware Forum
A forum dedicated to all things Slackware. If you have got a question related to Slackware, this is a good place to ask. http://www.linuxquestions.org/questions/slackware-14/