"From dorm room to boardroom. OpenSolaris has everything you need to
take your brilliant idea, build a prototype, test it, deploy it, and
run it on production servers -- out of a loft, or across your
enterprise. And when your application goes viral, you won't have to
throw hardware at the problem, or switch to a different OS. OpenSolaris
is industrial strength and built to scale from the get go. The live CD
makes it simple to boot to a fully functional desktop environment,
including Firefox and Thunderbird. Try it without fear -- our instant
rollback feature works like a giant undo button, so your system is
always protected, and you'll never lose work. And, you can load
OpenSolaris 2008.05 easily in a variety of virtualization technologies
including the open source VirtualBox hypervisor."
http://www.opensolaris.com/get/