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If there was any doubt about how hot Virtualization is, check this Bloomberg Report on the initial offering for VMWare for US$ 957M. |
Virtualization is happening at multiple layers in the hardware/software stack. At the bottom we have things like the Sun's ldoms - see this screencast of how to boot 64 Solaris domains on the recently launched UltraSPARC T2. Higher up we have things like Xen and VMWare.
Virtualization is a complex landscape; I'll ask Tim for a pointer to a good short description comparing and contrasting the solutions, the wikipedia entry is particularly unhelpful.