Well , nice feature, but still looks like another VMWare - you are sandboxing the whole OS. What if I want to run my already preinstalled program in a sandbox mode to prevent viruses getting into my OS? A browser, for instanace. And not a fresh one, but the one I already have! And with one single click. And what if I want to get downloaded files, like PDFs, zips, msi's outside sandbox on the fly immediately after downloading them, because I know, they are safe? What if I want to test a virus in a sandbox and see the traces it leaves in my OS? Having a virus ran in separate OS would mean having all the traces of its activity being spreaded through the whole OS "image" ! But I (as a virus analyst or whoever) want to have them locked in a single folder! These things are for sure unachievable in that kind of sandboxes. But still possible in sandboxes, based on filter drivers technology like SHADE Sandbox, for instance :)