Linux From Scratch - LFS is a project that provides you with the steps necessary to build your own custom Linux system.
Advanced Bash-Scripting Guide - An in-depth exploration of the art of shell scripting
Site includes Bruce Barnett's tutorials on UNIX shell programming and various other arcane subjects.
Shell Quotes - How to use quotes in a shell script.
Regular Expressions - Written for Solaris, so your milage my vary..
SED - The Stream Editor - Editing a data stream.
Bourne Shell - Everything you wanted to know.
AWK - The basic power tool for UNIX.
Introduction to Computer Science and Java Programming at Princeton.
Thinking In Java, by Bruce Eckel. TIJ is free (hard to beat that price) for download.
Randal L. Schwartz Columns - Randal L. Schwartz writes a monthly column for Linux Magazine, a monthly column for the Perl Journal, and a bi-monthly column for SysAdmin Magazine. New columns are placed on-line according to the agreements he has made with them, generally around three months after they've appeared in print.
NEWWWSBOY - This is a set of scripts built for a running news sort of a web page. It allows you to set up a couple of inputs, just use email messages, and have those inputs automatically formatted and stuffed into a set of configurable web pages.
HTNEWS - htnews is an E-mail robot. It makes it easier to insert news items to your webpage. You have simply to send an E-mail to a special address and the item will be inserted. htnews is highly configurable, supports templates