On this page I've collected some (hopefully:-) interesting links on the following Linux topics:
Official - Help/Docu/Search - Uptodate - Mail/News - Software - Tuning - Programming - People'n'Patches - Special - Quotations/Sayings - Misc

Linux became only possible because 20 years of OS research was carefully studied, analyzed, discussed and thrown away.
You have moved your mouse. Windows must be rebooted for the changes to take effect.
We are Linux of Borg. You will be mounted. Ejection is futile.

• linux.org - the Linux pages
• linux.org.uk - information from Great Britain

• Linux Newbie
• LDP - Linux Documentation Project; HOWTOs; Man Pages; kernel documentation; Linux FAQ
• The Wonderful World of Linux 2.6 (2.4; 2.2) - overviews
• Linuxcare - technical information
• Kernel Glossary
• Linux Kernel Hacker's Guide

• Linux Weekly News (articles; kernel index) - daily information and weekly summary
• "The SCO/TSG problem": Groklaw (background information; headlines; legal documents; timeline; news picks; "mission statement"); TuxRocks (court documents; recent); scofacts.org: overview, results, courtroom proceedings, Canopy/Yarro lawsuits; finance.yahoo.com: stock (after-hours, history), discussion (full), insider trading; Wikipedia page; an SEC complaint; 294 items vanishing; Slashdot: Caldera/SCO; Pacer (recent); reports from Dion Cornett; GNU page; Rob Enderle: keynote at SCO Forum 2004, analysis, Groklaw article (title change), "Advice"
• Kernel Traffic - weekly overview of current topics on the kernel developers' mailing list
• Kernel Trap
• Kernel Newsflash - known problems and important bug fixes for kernel versions
• Linux Gazette
• Linux Today - up-to-date articles on Linux; overview Linux 2.4; overview Linux 2.2
• Kernel Cousins - related to Kernel Traffic, but different topics (e.g. KDE)
• Linux Headquarters
• Linux Journal - "the premier Linux magazine"

• Kernel Mailing List Archive; Kernel Mailing List FAQ
• Linux Mailing List Archives; The Mail Archive; Tux Mailing List Archives
• Kernel Newbies (IRC)
• Security Focus
• Newsgroups

• Distributors: Debian; Red Hat; Slackware; Ubuntu
• Fresh Meat - new software releases
• LSM - The Linux Software Map, database pointing to recent Linux software
• LinuxApps - many links to application software
• Emacs - an extensive, fast tex editor
• Gimp - "the" image manipulation software for Linux
• Internet browsers: Amaya; Arachne; Dillo; Links; Lynx (text mode); Mozilla; Netscape; retawq (text mode); w3m (text mode); List of web browsers for Unix and Unix-like operating systems
• X Window System: x.org; source code; Programming; specifications; X Screensaver (Flying Windows)
• Apache (httpd) - User Authentication
• Linux software by Lars Wirzenius
• Open-CMS - an extensive Content Management System as Open Source
• Lilo - "the" boot loader by Werner Almesberger
• sysvinit - boot control
• syslinux - boot loader
• ext2fs Utilities - utilities for the standard file-system of Linux; dosfs
• fdutils - Tools for floppy disks
• tomsrtbt - a Linux system for a single floppy disk
• BYLD (Build Your Linux Disk) - tool for putting Linux systems on single floppy disks
• bzip2 - very fast, effective (de-)compressor for ".bz2" files
• Appletalk Configurator
• Tools for Cyrix processors
• Gnu tools (FTP)
• macutil - (de-)compression of Mac OS specific files (.sit, .hqx, ...)
• Database engines: mySQL (optimization); PostgreSQL; Borland Interbase (Open Source since July 2000)
• Links to many other tools can be found in the file "Documentation/Changes" in recent Linux kernel source trees (e.g. in 2.4.19).

• Linux Scalability Effort
• Linux Scalability Project - how to "support greater network server workloads more reliably"
• Lockmeter - measures for how long kernel spin-locks are contended
• Performance Monitoring - makes access to performance monitoring registers of newer x86 CPUs possible
• Linux Tips & Tricks
• Benchmarks - comparison of many kernel versions from 2.0 to 2.4
• File systems performance comparison

• Linux Programmer's Guide
• gcc - "the" compiler for C/C++ (documentation)
• glibc (FTP)
• Integrated development environments: Kdevelop; Code Crusader; Jessie; Redhat Source Navigator; others
• Pentium Compiler Group - gcc optimizations for Pentium (and newer) processors
• svgalib - a standard library for programming Super VGA graphics cards on Linux
• Linux Threads - multithreading library (Threads tutorial)
• State Threads (library)
• libdbi - C library for database access abstraction
• liboop - "supports the development of modular, multiplexed applications which may respond to events from several sources"
• Cascade - 2D/3D visualisation subroutines (Open Source; e.g. for CAD software)
• X Programming Tutorials
• Source Exchange
• Free Pascal
• SUSv4 Standard (Single Unix Specification; Open Group)

• Linus Torvalds Documentation Project
• Alan Cox - works on stable kernels so that Linus can spend more time on the development kernel series
• Andrea Arcangeli - puts out many patches (optimisations and bug fixes) for scheduler, memory management et al.
• Dave Jones - patches for several kernel parts; diary; PowerTweak
• Richard Gooch - publishes the Kernel Newsflash (see above) and develops the devfs (Device File-System); FTP
• Alexander Viro (FTP)
• Rik van Riel - kernel patches, mostly for memory management and scheduling
• David Weinehall (diary) - manages 2.0.x pre-patches
• Albert Cahalan - many links
• Pavel Machek
• Tigran Aivazian
• Linux Kernel Patch Archive
• recent patches
• "Who's who?"s: at tux.org; at Linux Magazine; group picture
• buildkernel - a script to simplify the patching of kernels
• Search for recent patches in the Linux kernel mailing list

• LKI - Linux Kernel Internals
• Linux-MM - memory management
• ALSA - Advanced Linux Sound Architecture
• USB - Universal Serial Bus
• Kernel Book
• Network Packet Handling (a figure)
• Kernel Versions - all versions from 0.01 to current
• Linux for Power PC boxes; MOL (Mac on Linux)
• uClinux - Linux on microcontrollers; esp. for processors without MMU (memory management unit)
• Old Linux Wishlists (one for 2.2)
• Keyboard scancodes

• Linus Torvalds: "Technology is uninteresting if it doesn't solve the right problem." (source)
• Bill Gates, 1983: "Nobody will ever need more than 640 kB RAM."
  Bill Gates, 1999: "Windows 98 requires 16 MB RAM."
  Logical conclusion: "Nobody will ever need Windows 98."
• Linux is like a tent: no gates, no windows, and an Apache inside!
• Linux is user-friendly. It's just selective about who its friends are.
• Linux is user-friendly. It's neither ignorant-friendly nor idiot-friendly.
• Windows - Will Install Needless Data On Whole System
• We are Linux of Borg. You will be mounted. Ejection is futile.
• You have moved your mouse. Windows must be rebooted for the changes to take effect.
• Linux became only possible because 20 years of OS research was carefully studied, analyzed, discussed and thrown away.
• Linux hackers are funny people: They count the time in patchlevels.
• Debuggers are for bad programmers!
• Technology is a constant battle between manufacturers producing more idiot-proof systems and nature producing better idiots.
• Mac OS: "It simply works." - Winblows: "It simply crashes." - Linux: "It 'simply' must be configured..."
• "I heard about that new Windows XP, and I wonder what 'XP' could mean. Can you explain?" - "That's easy: eXtra Pain..." - "You seem to know lots about abbrvs. Can you tell me what 'AC/DC' means?" - "Hmm... a completely different concept."

• Linux Standard Base - "develop and promote a set of standards that will increase compatibility among Linux distributions"
• Bit Wizard
• Ibiblio-Archive
• DIPC - Distributed Inter-Process Communication
• Linux Study - psychological exploration of the Linux development process
• operating system basics (not Linux-specific)
• SourceForge - free Internet services for Open-Source projects
• DinX - experimental windowing system
• Amazing Linux Desktops - many nice screen-shots
• Blue Screen Of Death - a screen-saver simulating a Winblows-like system crash message
• Myths About Linux; Linux Security Myths
• Linux Penguin Sticker Movement
• LWN Penguin Gallery; penguins :-)
• BIOS Compendium (free download!)
• Hardware information; interfaces (ISA, PCI, PCMCIA, ...)
• Ten Commandments for C Programmers (annotated)
• Abbreviations etc.: Jargon File; Acronym FAQ

Note: Linux is a registered trademark of Linus Torvalds.