FAQs, Help, and Tutorials

Gateway to Real-Time Interaction
Contains basic information, networks, channels, and links for new users.
http://www.snowhawk.com/irc.html

IRC Etiquette
A basic introduction on what people should and should not do on IRC. English and Finnish versions are available.
http://irc.mzl.fi/

IRC User's Survival Guide
An introduction to "vanilla IRC", mostly as defined in RFC 1459 and/or implemented on IRCnet.
http://www.anta.net/irc/survival.shtml

IRCBeginner.com
Contains documents and FAQs for the beginner.
http://www.ircbeginner.com/