There have been a few articles about creating virtual clusters using Xen, for example http://www.clustermonkey.net//content/view/161/33/. It's pretty easy to create a virtual cluster with VMware, too. You can find pre-made virtual machines for a 2 node ParallelKnoppix cluster at http://www.parallelknoppix.net/pmwik...=Main.HomePage
Knoppix 9.1 Live Linux GNU Bootable USB Flash Drive USA
$19.99
$8.50
Knoppix Live GNU Linux System 9.1 on Bootable CD / DVD / USB Flash Drive
$9.99
New Knoppix 9.2 Pro Bootable Live OS x86 64Bit DVD Linux
$9.97
Linux Knoppix 4.0.2 Installation Disc
$39.99
$12.00
Knoppix Linux Bootable OS v8.6 "Original Live Operating System" 32G USB Stick
$20.30
KNOPPIX 9.1 LINUX INSTALL & LIVE DVD
$9.99
Acer Aspire One 9 inch Netbook ZG5 512MB RAM 8GB SSD HD Knoppix Linux WiFi VGA
$79.99
Knoppix Linux Bootable OS v8.6 "Original Live Operating System" 16G USB Stick
$19.95