I use CoRD for multiple desktops on OS X - it works like a charm. But what about Windows users, what can they use? After reading a bit on
Dugie's Perspective, I read about
MuRD (multiple remote desktops), which does exactly this trick.
Further reading on his blog points out to vXCopy, which is like xcopy on sterorids (which was like the copy command on steroids).
I haven't tested any of the two, but I am sure the Virtualization crew at the upcoming Munich event will put vXCopy to the test when copying VMs through the network.