I've released a 64 bit version of parallelknoppix, a live CD that lets you set
up a cluster for MPI-based parallel computing in about 10 minutes, without
installing anything to the computers in the cluster. openmpi v1.2.1 (and lam and
mpich) are all supported. Test reports are welcome, since this is an initial
release and I have limited hardware to test it on. See www.parallelknoppix.net
for more information.