The way I understand it, many of the big vendors are saying Virtual PC/Computing is the future (Or at least they are trying to make it that way). With VMware giving away VMware server and player, M$ doing the same with Virtual Server, Xen coming up strong, UML being visible in the background, and Qemu having a loyal fanbase... It is definitely a part of computing as we speak. Not to mention as James S stated, virtual PC are becoming the norm for R&D shops. Some really big players are banking on the Virtual PC realm, going so far to say that even devices will soon become virtual (Routers, firewalls, PBX, IPS/IDS, etc... as well as multi OS & architecture systems.) AIX allows for virtual partitions if my memory serves me correctly, and RedHat has intergrated Xen into their distro. Again, as I understand it, some vendors are saying that in the future you'll just create your needed network device from unused CPU/processing power (Much like you can create your own virtual network or virtual honeynet). It will be like a blade-like environment where you have a rack of processors, a rack of storage, and a rack of *insert-other-requirement-here*, then you have all virtual servers/devices. Rather interesting indeed, but a good ways to go (not enough standardization to achieve it just yet).
Though Virtual computing is good, it is not a silver bullet to the rootkits, exploits, nor vulnerabilities prevalent today. The virtual pc may be housing some sensitive information yet the OS could be vulnerable to a type of attack or exploit, then you have a virtual problem on your hands (pun intended
Kernel/Stack protection and jailed memory allocations seem to be promising additions to some of the problems (OpenBSD seems to be leading the way in this realm). That way if your chrooted webserver gets violated, they can't get to anything outside the jail.
Carrot: I agree, way to many licenses... Seems like to many are being created for the bragging rights and nothing more. No many can be the other edge of the sword (whereas the 'not enough' is the other side).
Sincerely,
Shaman