I was looking on the Cluster Foundry at Sourceforge and came across a link to the Condor Project at the University of Wisconson at Madison. The Condor Project runs across multiple systems. They have versions for Windows and Linux.
We have been looking at using openMosix as the cluster component in Turtlshel Linux for the PSC, but openMosix hasn’t been ported to Windows yet. If we did use Condor instead, users could use a Windows machine as the master computer if they wanted.