If you have enough processing power, you can easily fire up multiple virtual machines, run them simultaneously with KVM, and manage all of them through virt-manager with ease while keeping track of the resource usage.
Firing up a few Linux distributions is painless with virt-manager and you can even pause a live VM.
Virt-manager / libvirt makes Linux virtualization incredibly easy to use -- for nearly anyone -- while at the same time being very feature-rich and sets the stage for more virtualized innovations to come in the future. Virt-manager is a great addition for Ubuntu 8.04 "Hardy Heron" and will certainly open up more users to the growing world of virtualization.
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