The Chinese black market has started selling copies of Windows 7 on USB disk drives. Microsoft considered doing this at one point, but that idea never came to fruition.
Full Story: http://arstechnica.com/microsoft/news/2009/12/pirates-offer-windows-7-on-usb-sticks.ars
Full Story: http://arstechnica.com/microsoft/news/2009/12/pirates-offer-windows-7-on-usb-sticks.ars