I would argue it is pretty sad that the tools needed to abstract the OS from hardware are tied to specific platforms. Companies that pride themselves on delivering “cloud services” without the constraints of operating system force us admin types to have machines we wouldn’t otherwise. Take for example my ESXi cluster in the basement. I have a single XP Virtual Machine who’s sole purpose is to admin vSphere. A company with such a rich history of Linux and OSS support drives me crazy at times. (see also PCoIP support from VMware with their Linux/Mac Client)
As I test virtualization platforms I try to keep a matrix that shows which tools will manage what host types. I figured it could be of use to some other architects and CTO out there. If I missed any please let me know!