There's a new version of parallelknoppix available. This is a remaster that will let you create a cluster for parallel computing in very little time. If you use this you should definitely update to this version.

Screenshot

More info

Changes:
* removed packages to get image size down (~460MB now)
* configuration is now XDIALOG based: click, click
* package updates (lam, octave, and a few others)
* has a working example of GNU Octave running in parallel, using MPITB

Happy T-day, Michael