One of the Windows techs came to me today asking if we could set up an affinity rule in VMware to limit all our assorted Windows Server VMs to three hosts in the farm, some licensing thing, I dunno.
VMware 5.0 ships with a new feature known as VM Storage DRS. Though you're probably more familiar with host DRS, don't confuse the two. Storage DRS' design is to take some pressure off of VMware ...