Also, just read Fred Langa's most recent free version of his newsletter at:
http://langa.com/newsletters/2006/2006-01-09.htm
where he, and a questioner, talk a little about "community-built virtual machines":
"The "community-built virtual machines" are, in essence, a complete, fully-set-up PC, emulated entirely in software, that runs inside your current operating system:
The VMware community continues to create downloadable virtual machines that run in VMware Workstation and the free VMware Player. Three new virtual machines contain the OpenACS web application toolkit, the IPCop firewall, and the Sguil network analyst console. Other new virtual machines contain distributions of Kubuntu, Debian, Fedora Core 4 and 5, FreeBSD, and KDE 3.5 on SUSE....
The downloadable virtual PCs are available at
http://www.vmware.com/vmtn/vm/
You can download and use these virtual machines just as if they were a normal, stand-alone PC."
What do you think about that idea?