Get ready for the new machines that are built to run WIndows 8. They will have a TPM installed that only has MS WIndows as a boot option. Booting from USB/CDROM will now be impossible if the BIOS vendor doesn't give you a way to disable the TPM or reload a new boot signature. So, If you're thinking of getting a new machine this year, you better do it before WIndows 8 becomes official. Once that comes out, you might have to switch to an ARM-based machine to escape the Microsoft monopoly.