Kingston Technologies DataTraveler Workspace (Windows to Go)
I've been using a Linux Live distro for years to test machines. Booting from a USB stick goes a long way toward finding software problems masquerading as hardware problems. Now I have a Windows version from Kingston that doubles as a way to carry a desktop in your pocket. Just boot from the USB, and you have a full Windows 8 workstation that has a small writable partition for customization and a few apps. It's a great way to test if an old workstation will run Windows 8. It also allows contractors to use your workstations with a lot less worry about having to regen afterward. You can lock the local hard drives away from prying eyes through a simple group policy change.