Great python script, makes life very easy: UbuntuZilla.

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From the site:
GroundWork Monitor Community Edition provides a essential IT monitoring solution that enables you to maintain network visibility and control.
This is a single server deployment that leverages the strengths of 15 other open source projects such as Nagios, rrdtool and nmap. It combines the results of these projects in to a system that evaluates [...]

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Click here for details.

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An excellent article on the subject: Source.
Run these 3 commands from shell. SUDO not required.
VBoxManage setextradata “name of vm” “VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/HostPort” 2222
VBoxManage setextradata “name of vm” “VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/GuestPort” 22
VBoxManage setextradata “name of vm” “VBoxInternal/Devices/pcnet/0/LUN#0/Config/ssh/Protocol” TCP
Where…

“name of vm” is your virtual machine name
ssh is the name of the service. This is _required_ to be unique among the three [...]

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This tutorial will explain how to add Ubuntu 8.04 desktop to win server 2003 Active Directory using Likewise Open.
Likewise Open is a free, open source application that joins Linux, Unix, and Mac machines to Microsoft Active Directory and securely authenticates users with their domain credentials.

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When you need to run a website (https), mail (ssl/tls) or similar over an encrypted link - you need an SSL certificate. This article will explain some of the choices involved, and how to run your own certificate authority (CA). You don’t need to spend any money to generate your own certificates, and they’re no [...]

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A well-written article on how to backup an entire partition using DD.
Another way to do this is to use CloneZilla.

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Places to buy systems with Linux pre-installed (which means the hardware is Linux compatible!). There may be others, this is just a short reference.
1) Dell: Dell is currently selling four laptop systems starting from $549 to $1049; the linux desktop system available starts at $448. All these system are pre-installed with Ubuntu 8.04. here:
2) system76: [...]

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Source: UbuntuGeek
The GNU MP3/Media Streamer is a simple application which makes it possible to navigate through your audio and video collection via a browser, and stream playlists across a network.GNUMP3d is a streaming server for MP3s, OGG vorbis files, movies and other media formats.The software supports browsing, searching, and streaming all via your browser with [...]

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Some of these are to be taken with a grain of salt,
your mileage may vary:
_______________
Harder:
- Anatomy of Security-Enhanced Linux (SELinux)
- Understanding AppArmor
- grsecurity
- What is Linux Security Module?
- 10 Basic Linux Security Tips to Implement
- The Best Linux Security Tools
- Linux Audit and Intrusion Detection
- The Unix security audit and intrusion detection tool
- Top 100 [...]

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From Linux.com:
Unless you have fully embraced the virtualization movement, you probably have more than one machine in your home or office, particularly if you run more than one operating system, and you probably have more than one keyboard and mouse on your desk. If you would like to regain some desk space without having to [...]

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Extract the files in the .ISO to a USB stick and boot off that, then on-bootup, install from the USB key, quite simple.
Here’s the full howto.

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Source: feraga.com
Howto use Cryptsetup with LUKS support. (Debian Linux).

This is a short howto to describe the basic usage of Device-Mapper, DM-Crypt, and Cryptsetup to mount and use encrypted partitions and container files.
This is partially in response to the recent articles about the numbers of USB flash thumbdrives that are regularly lost. If we learn [...]

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The 1 page Linux CommandManual
Linux Command Reference
Linux Security Quick Reference
The Gimp Hotkey Reference

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Source: hungry-hackers.com
Gmail Account Hacking Tool:
A tool that automatically steals IDs of non-encrypted sessions and breaks into Google Mail accounts has been presented at the Defcon hackers’ conference in Las Vegas.
Last week Google introduced a new feature in Gmail that allows users to permanently switch on SSL and use it for every action involving Gmail, and [...]

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The GNOME desktop environment is the default for Debian (and one of it’s more popular distros, Ubuntu), and is one that I use every day. One thing that I always have a hard time remembering is how to setup global keyboard shortcuts, so this quick guide will document the process.
There is a simple applet (reached [...]

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Source: help.ubuntu.com
Preparing for backup

Just a quick note. You are about to back up your entire system. Don’t forget to empty your Wastebasket, remove any unwanted files in your /home directory, and cleanup your desktop.

Depending on why you’re backing up, you might want to:

Delete all your emails
Clear your browser search history
Wipe your saved browser [...]

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Source: Techcrunch (Click for the full article.)
From the article . . .
All of a sudden, Yahoo and Google want to make it easy for you to opt out of their ad targeting on both their sites and across the Web. Yahoo announced a new one-click opt-out policy today, and Google made it possible to opt [...]

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Now, you can virtualize your operating systems without the need for a full-fledged host to run. VMware’s famous ESX platform (a small 32MB footprint which in turn hosts the virtual operating systems) is now available for FREE, where one can them devote most of the system resources for multiple VMs on one machine, without the [...]

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Source: PenguinPetes.com
1. You’ll need to connect the new drive onto the IDE cable. Most IDE cables have two plugs for hard drives. The headache comes with determining which drive is a master and which a slave, so the computer knows which one to boot to. No two hard drive manufacturers have the same standard for [...]

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Don’t order any Laptops or PC’s with these NVidia chips … they fail.
Related: Ten Dell models have defective Nvidia GPUs.
(HP and ASUS and all other vendors are equally affected as the NVidia chips themselves are faulty).

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Fun with rename:
1) To rename filenames with CAPS characters to lowercase:
rename ‘y/A-Z/a-z/’ *
2) To remove <spaces> from filenames:
rename ’s/ /-/g’ *
3) To strip files with the .bak extension:
rename ’s/\.bak$//’ *.bak

Free: The free command displays the amount of free and used memory in the system. For example, free -m gives the information using megabytes, which is [...]

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Source: Ubuntu Wiki.

Recording Skype calls
NOTE: This howto uses examples geared toward recording with gnome-sound-recorder. If you are using KDE, go to the bottom of this howto and click on the original link. There you will find additional info on using kmix and krecord. The basic howto is still the same.
What you’ll needed

ALSA utilities(alsamixer) found in [...]

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Tips from IBM, not all that complicated, but worth looking at.
Other tips include…

Sharing computers on a Linux (or heterogeneous) network.
IBM’s top 10 Linux articles and tutorials.
Miscellaneous tips.
Linux-powered networking: Part 1, Part 2 and Part 3.
Industrial-strength Linux box lockdown, a howto: Part 1 and Part 2.
Introduction to cryptology concepts: Part 1, Part 2 and Part [...]

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Source: LinuxHaxor.net
Essentially RTorrent, CTorrent and Transmission-CLI.

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