Joanna Rutkowska s Qubes OS project will include a feature to create one-time use-and-discard virtual machines. The idea behind Disposable VMs is to have very lightweight virtual machines that can be created and booted quickly with a sole purpose of hosting only one application. Rutkowkska said it would an ideal feature to open untrusted documents, especially when there’s an element of risk. Qubes is based on Xen, X and Linux and relies on virtualization to separate applications.
Source: https://threatpost.com/rutkowskas-qubes-os-implement-disposable-vms-060310/74053/