JeOS
Nagios Virtual Server Monitoring in 15 Minutes – Intro
Feb 26th
Nagios allows you to graphically monitor your virtual servers from a single web page. No longer will you have to load each individual website or web service in order to verify consistent operation. Nagios can be downloaded directly from their website at: http://www.nagios.com On the Nagios homepage is a link to a 15 minute tutorial, which is relatively straight forward, and works like a charm. I recommend Ubuntu JeOS for your virtual OS specifically because the kernel works flawlessly with the host operating system.
Debian VirtualBox Guest OS Causes High and Constant Host CPU Load
Feb 23rd
For the longest time I was using Debian for my guest operating system, and was relatively frustrated that the host OS always had a constant CPU load of over 20%. I tried many times to compile a custom kernel to resolve this issue, and in the end I decided to switch to a new OS. At first I though Ubuntu server edition was the way to go, but when I was installing the system there was all these gnome, and other graphical components being installed. What is the purpose of openoffice files in a terminal based OS? Overall Ubuntu JeOS is the way to go! It will only install the base Ubuntu system, comparable to how Debian can be configure during the installation process. The kernel used in JeOS does not cause the host to have a constant CPU load, therefore I am overwhelmingly satisfied with its performance. If you are experiencing high host CPU load with your guest OS, I recommend experimenting with different kernels, and possible switching to a different OS if you cannot resolve the issue. There is no reason your host CPU load should be high when the guest is not processing any data. JeOS is the way to go 
Ubuntu JeOS
Nov 7th
Je = Just enough. This distribution is a minimal installation specifically tailored to the VMWare software package. By providing just enough OS power to get VMWare running, a computer with JeOS will eliminate all wasted space associated with a Desktop installation that is not needed for a Virtual Server environment. With a reasonably powerful computer, JeOS, and VMWare you will be able to deploy multiple Virtual machines on a single host allowing for easy backup of different server components. The main benefit of a Virtual Guest OS is its one file storage method; a quick drag and drop to a usb Hard Drive and a backup is quickly achieved. Launchpad is the home for JeOS developments, therefore for updates and news check there: https://launchpad.net/ubuntu-jeos/ For the most recent Ubuntu JeOS image check out the repos: http://cdimage.ubuntu.com/jeos/releases/gutsy/release/ I have added a JeOS VirtualBox VDI image to VirtLinux.com. It is available on the high speed downloads page. http://www.virtlinux.com