Because any site has to have a links section, here I provide mine:

The power of free software!

GNU's Not Unix! - the GNU Project and the Free Software Foundation
SourceForge - The "home sweet home" for every free software
Freshmeat - Daily news about free software releases
SunSite - Open Source Hosting

Daily News

Slashdot - News for nerds, stuff that matters
NewsForge - The Online Newspaper of Record for Linux and Open Source
Linux Today - Linux News On Internet Time
OSNews.com - Exploring the Future of Computing
osOpinion - Tech Opinion Commentary For the People, By the People

GNU/Linux

TLDP - The Linux Documentation Project
TermUnitX - A great comics featuring Tux
The XBox Linux Project
Linux Games - Even Penguins Want To Have Fun
Linux Counter
Linux-APUS - Linux for Amiga Powered Up Systems
Linux for PlayStation 2 Community
Linux Devices - The embedded Linux portal
Screenshots of a little dual processor box running linux
Linux Box

Developing

LibSDL - Simple DirectMedia Layer is a cross-platform multimedia library
Python - Python Programming Language
SCons - A software construction tool
PHP - Pretext Hyper-Processor (a widely-used general-purpose scripting)

Graphics

GIMP - The GNU Image Manipulation Program
ImageMagick - Convert, Edit and Compose images
Blender - Very powerful and complete 3d graphic free software program
POVRay - The Persistence of Vision Raytracer
YAFRay - Yet Another Free RayTracer

Audio

Ardour - A digital audio workstation. Record, edit and multi-track mix
Rosegarden - The closest native equivalent to CubaseŽ for Linux
Audacity - A free audio editor
GNUsound - A sound editor for Linux
Sweep - An audio editor and live playback tool
Hydrogen - A QT based drum machine

Internet

Sylpheed Claws - A branch of Sylpheed, a GTK+ based, lightweight, and fast e-mail client

Games

Cube - Free software Quake-like fps that uses SDL/OpenGL
Eternal Lands - Free Massive Multiplayer Online RPG
Racer - Free car simulation project based on OpenGL
FreeCiv - Free software implementation of Civilization in multiplayer
FlightGear - Flight Simulator
Corewars - King of the Hill - Assembly programs war

Very Interesting

TeamSpeak - Cross-platform voice communication tool
Framsticks - Artificial Life - 3D evolution and simulation
Nectarine - Your Demoscene Radio
HVSC - The High Voltage SID Collection
Uzix - UNIX Implementation for MSX
SIMH - The Computer History Simulation Project

Cool!

The Silicon Graphics Refrigerator Project
The QNX Dreamcast Project
C64 Web server

Amiga

Aminet - A huge FTP archive of Amiga software
amiga.org - Daily source of Amiga related news
Amiga Interactive Guide - Every Info on every Amiga
AROS - Amiga Research OS
MorphOS - AmigaOS inspired PowerPC OS
Sixgirls.org - An NetBSD server running on an Amiga 4000 with MC68060

Our dear M$...

Fuck Microsoft!
The Halloween Documents
Windows Refund