Agreed. Between Citrix (xen) and Redhat (kvm), as well as the related open source offerings, keep getting better. I think the main area that VMWare still has a

Agreed. Between Citrix (xen) and Redhat (kvm), as well as the related open source offerings, keep getting better. I think the main area that VMWare still has a win, from people I know who use it, are management tools and the ability to prioritize/allocate/throttle IO on network block devices (SANs) per vm.