I don't think you need any special tools. All you should need to do is install clusterknoppix on one box. Then apt-get your encoding software (dvdrip etc). Then boot all the other machines you want to add to the cluster from clusterknoppix cds. They should all automatically join as nodes. You may want to view the clusterknoppix documentation page for more info, but I think this is all there is to it. Let me say that this is a very good idea too.