I was just asked by my wife to prepare her a windows and office pc to practice office 2013 and I think it would be useful to have a CD that can boot any iso I download from the internet and after that any OS I have on any drive.
I have a linux distro on, will put xp lite to start fast and after that I have to repair what windows does to the bootloader. This means 2 CD's or USB keys. One would be so much better. And the best is I would only have to burn it once... Hiren's Boot CD...
Also useful in cases where the bootloader gets it.