I meant deployments of software without an operating system other than Xen. Running an operating system on Xen means that you now have the Xen kernel and guest kernel that can have bugs.
I knew I must have been misunderstanding you. No, I am not aware of any.
I was talking about client workstations in non-technical environments where central command wants to be able to patch your OS. The Hypervisor downloads OS of the day and runs it, the OS downloads personal settings from some shared server and you have your environment on a disposable workstation.