Windows 8 To Go (From USB drive)
"But Windows 8 does offer a "mobile" alternative that may at least pique business and tech support users' curiosity: Windows to Go, an installation of Windows 8 that boots from a USB thumb drive. In theory, Windows to Go could give administrators a way of creating a verified, locked-down image of the Windows 8 OS that can be given to wandering users, temporary off-site contractors, or telecommuters to allow them to connect to the corporate network with confidence from their own (or someone else's) computer."
By now you probably have heard or read at least a story or two about Windows 8. Microsoft released a Windows 8 developer's preview about six months ago, and has just recently released a consumer preview. If you like to poke around at new technology then with the consumer preview you can download the code and test it out on your (hopefully) spare home computer. One of the really interesting aspects of this Windows 8 preview release is the ability to create a bootable USB drive. Ars Technica has been examining this capability and has suggested a number of scenarios where it could be very useful (e.g. tech support or temporary access to corporate networks). They have also prepared a recipe for how to create your own version of the bootable USB drive. The Read link has all the details.