Here is a huge list of Links/Online Guides/Forums for Linux .. These are mainly Official Links which you can find on the respective site 
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***General Linux Guides/Links ***
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The Linux Documentation Project : - The Linux Documentation Project
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How-To : - Index of /pub/Linux/docs/HOWTO/other-formats/html
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Easy Linux : - Main Page -
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HowtoForge : - HowtoForge - Linux Howtos and Tutorials | Howtos about Linux and Open Source
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Distro Watch : - DistroWatch.com: Put the fun back into computing. Use Linux, BSD.
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ELG : - EasyLinuxGuide
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MJM Wired : - mjm wired :: Resources
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Filesystem Standard : -
- Linux Reality : - Linux Reality
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**Canonical - Ubuntu **
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Ubuntu Guide :- Ubuntu:Feisty -
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Ubuntu Official Guide :-
https://help.ubuntu.com/6.10/ubuntu/desktopguide/C/index.html
- Wikipedia :
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Ubuntu Linux Resources :- Ubuntu Linux Resources
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Forum :- Ubuntu Forums
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Blog :- Ubuntu Blog | UbuntuOS
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Mailing Lists :-
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Community :- Ubuntu Community | Ubuntu
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Home Page : - Ubuntu Home Page | Ubuntu
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***Canonical - Kubuntu Linux
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Kbuntu Guide : Feisty - Kubuntuguide
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Kbuntu Documentation : Kubuntu - Documentation
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Wikipedia :
http://wiki.kubuntu.org/Kubuntu
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Forum : Ubuntu Forums
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How to :
https://wiki.kubuntu.org/HelpingKubuntu
- Home Page : Kubuntu - The KDE Desktop
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Canonical Edubuntu Linux
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Edubuntu Guide : doc.ubuntu.com/edubuntu/handbook/C/
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Edubuntu Documents : Documentation | edubuntu
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Wikipedia :
http://wiki.edubuntu.org/EdubuntuWiki
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How To : UsingEdubuntu | edubuntu
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Forum : Ubuntu Forums
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Home Page : Edubuntu Home Page | edubuntu
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Novell - SUSE Linux
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Suse Guide : OS Guide: Suse 9
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Suse Wiki : Main Page - SUSE Wiki
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Official Guide : Novell Documentation
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SUSE FAQ : Unofficial SUSEFAQ - Unofficial SuSE FAQ
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Mailing Lists :- Linux: Linux Operating System—SUSE Linux Enterprise
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Home Page : - openSUSE.org
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***Redhat : Fedora Linux
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Fedora Guide : Fedora FC6 -
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Fedora Frog : - Fedora frog -
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Stanton’s Notes : Fedora Core 5 Installation Notes
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MJM Wired’s Notes :Personal Fedora Core 6 Installation Guide
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Official Guides : Fedora Project, sponsored by Red Hat
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Forum : FedoraForum.org - Fedora Core Support Forum & Community
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Fedora Solved : Welcome to FedoraSolved.Org — Fedora Solved
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Fedora FAO : FAQ - Fedora Project Wiki
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Fedora Wiki : FedoraMain - Fedora Project Wiki
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Mailing Lists :- redhat.com Mailing Lists
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Home Page : - Fedora Project
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Mandriva Linux
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Mandriva Guide : - Mandriva -
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Easy Linux Wiki : - Mandriva -
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Official Documents :- Documentation - Mandriva Linux
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Forums : - Index - Mandriva Club Forum
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Blog : - Mandriva Blog
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Home Page: - Welcome / Home - Mandriva Linux
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Support : - Support - Mandriva Linux
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Mailing Lists :- Mandriva Linux Mailing-lists - Mandriva Linux
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Gentoo Linux
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Official Handbook : - Gentoo Linux Documentation – Gentoo Handbook
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Gentoo Wiki : - Main Page - Gentoo Linux Wiki
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Simple Guide : - Idiot guide to Gentoo Setup
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Development Guide : - Gentoo Development Guide: Master Index
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Portage : - Gentoo-Portage - News
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Fresh Ebuilds : - Gentoo Online Package Database
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Forums : - Gentoo Forums :: Index
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Blog : - A Blog Of Gentoo and other stuff
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Mailing Lists :- Gentoo Linux – Gentoo Mailing Lists
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Home Page : - Gentoo Linux – Gentoo Linux News
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Linspire / Freespire
- Linspire Guide : -
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Blog : - LinspireBlog
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Wikipedia : Linspire - Wikipedia, the free encyclopedia
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Home Page : Linspire - The World’s Easiest Desktop Linux
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Xandros Linux
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Official Guide : - Home Linux Operating Systems - Xandros
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Xandros Wiki : - XandrosKwikis - ArchLUG Kwiki
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Forums : - forums.xandros.com :: Index
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Support : - Xandros Support
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FAQ : - Xandros Support
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How To : - Home Linux Operating Systems - Xandros
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Home Page : - Linux Desktop and Server Operating Systems
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Knoppix Linux
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Knoppix Official Wiki : - Main Page - Knoppix Documentation Wiki
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Forums : - Knoppix Forum
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Mailing List :- Mailing List - Knoppix Documentation Wiki
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About : - KNOPPIX - Live Linux Filesystem On CD
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Home Page : - Knoppix Linux
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Debian GNU/Linux
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Debian Linux : - Debian Linux Tutorial - Beginners Guide To Linux Servers and Networking Installation and Set Up with Instructions On How To Configure A Home Server
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Users Manual : - Debian – DDP Users’ Manuals
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Debian Guide : - Dwarf’s Guide to Debian GNU/Linux
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Debian Guide : - GNU/Linux Desktop Survival Guide
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Wikipedia : - FrontPage - Debian Wiki
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Administration Resources : - Debian GNU/Linux System Administration Resources
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Debian FAQ : - The Debian GNU/Linux FAQ
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Debian Help : - debianHELP | Militantly FREE software support.
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Debian Forums : - Debian User Forums :: Index
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Mailing Lists :- Debian – Mailing Lists
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Home Page : - Debian – The Universal Operating System
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Support : - Debian – Support
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Slackware Linux
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Slackbook : - The Revised Slackware Book Project
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How-To : - LinuxPackages: Howto
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Forum : - LinuxPackages :: Index
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Handbook : - Slackware Handbook | The Slackware Handbook
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Basics : - Slackware Linux Basics
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Help Forum : - Slackware Help Forum – Slackers helping slackers. :: Index
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FAQ : - The Slackware Linux Project: Frequently Asked Questions
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Mailing Lists :- The Slackware Linux Project: Mailing List Info
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Home Page : - The Slackware Linux Project
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Advisor : - The Slackware Linux Project: Slackware Security Advisories
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Help Install : - The Slackware Linux Project: Installation Help
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***FreeBSD Linux ***
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FreeBSD Handbook : - FreeBSD Handbook
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Basics : - FreeBSD Basics
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Diary : - The FreeBSD Diary
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The Complete : - The Complete FreeBSD
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Blog : - FreeBSD Server Administration
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Community : - FreeBSD Community
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Home Page : The FreeBSD Project
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***Linux Mint ***
Wikipedia : Welcome to Wikimint! - Wikimint
Getting Started : Getting Started with Linux Mint LG #137
Forum : - Linux Mint Forums :: Index - Linux Mint Forums
Support : - The Linux Mint Support Center
Home Page : Linux Mint: Linux for the Desktop
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***DesktopBSD Linux ***
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DesktopBSD Wiki : - DesktopBSD/DesktopBSD Wiki Portal
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Forum : - DesktopBSD Forums :: Index
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FAQ : - DesktopBSD: FAQ
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Community : - DesktopBSD: Community
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Development : - DesktopBSD: Development
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Mailing Lists :- desktopbsd.net Mailing Lists
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Home Page : - DesktopBSD: Home
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***Saboyon Linux ***
Wikipedia : - Main Page - Sabayon
Planet : - Planet Sabayon Linux
Forum : - www.sabayonlinux.org :: Index
FAQ : - FAQ - Sabayon
Blog : - Seth Nickell - Design Fu : sabayon
SVN : - WebSVN - Subversion Repositories
Home Page : - Sabayon Linux Project Website
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***PC-BSD Linux ***
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Documentation : - PC-BSD Documentation
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Forum : - PC-BSD Forum :: Index
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Download PBI’s : - pbiDIR - Your PC-BSD software
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Blog : - PC-BSD | Blog
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Mailing Lists :- PC-BSD - Personal Computing, served up BSD Style!
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Support : - PC-BSD - Personal Computing, served up BSD Style!
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Community Service : - PC-BSD - Personal Computing, served up BSD Style!
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Data Base : - PC-BSD Knowledge Database - powered by phpMyFAQ 1.6.11
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Home Page : - PC-BSD - Personal Computing, served up BSD Style!
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*** Arch Linux ***
Arch Wiki : Arch Wiki
Beginner’s Guide : Beginner’s Guide [Must read for first-timers]
Official Install Guide : Official Install Guide
Forums : Arch Linux Forums
Mailing Lists : Arch Linux Mailing Lists
FAQ : Arch Linux - Frequently AskedQuestions
Home Page : Arch Linux
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That’s all for now addition will be appreciated 
Source: Respective Sites/ Google / Alta Vista .
Mods plz change the topic a bit 
