Ashless - sorry buddy - you messed up!
Ashlee - you don't often get it wrong - but this time you definitely messed up! :( Where?
a) virtualbox.com - Suns recent acquisition and available for immediate download and trial. Please check it out! Users have reported setting up a virtual Windoze XP in under 30 minutes. And it runs ***fast*** - much faster than QEMU. And faster than Suns implementation of Xen. Oh yes - you forgot about the qemu project under OpenSolaris too! :( Strike 2
b) vmware: Solaris and OpenSolaris already runs under vmware - except that the vmware *host* cannot be (currently) Solaris or OpenSolaris. But ... using a Windoze or Linux host, you can run Solaris and OpenSolaris guest VMs.
c) Ultimately its all going to boil down to *speed*, reliability/stability and manageability. If a user discovers (by trial/error) that they can run more vitual instances under OpenSolaris using Virtualbox than they can under vmware - then which VM environment do you think they'll run? Do you really think that the current generation of freetards has any loyalty to vmware - or any other provider of OS implementations? No - they want cheap (free), fast, reliable and easy. And they won't pay vmware a dime if they can get cheap/fast/free from anywhere else!
d) in the enterprise, management is going to be more concerned with manageability that *anything* else. They don't care about cost, care somewhat about speed and care a great deal about reliability and support. These are areas (as you know) where Sun has always succeeded. This is their playground!
Sun is ahead of the game IMHO. Its just that the "game" is currently wide open, and being an early leader like vmware has nothing to do with who/what wins out in the end. In fact, the computer landscape is littered with "early leaders" who did'nt survive in the long run.
BTW: one final point: virtualbox is damn good right now; imagine how much better it'll run with the brilliant minds of the Solaris kernel engineers - you know - people like Bryan Cantrill (DTrace) and Jeff Bonwick (ZFS and the slab memory allocator) - and a cast of dozens of talented (major) players.
Sun is correct with their policy of "no software before its time" with Xen. Everyone is totally pissed when their virtual machine goes "whoops" after investing serious man-hours into a project or task.
Sometimes the turtle wins the race.....