Re:Virtually Here (Score 1)

As I understand, Xen is the operating system and hypervisor all rolled into one, whereas Vmware is an additional layer on top of the host os.

More or less the case with regard to Xen, as I understand it. I know on my machine, Grub boots Xen, not Linux, and then Xen boots Linux. With VMWare I think it actually varries by product. VMWare Workstation doesn't work that way, but some of their server products do.