I am still trying to understand all the wonderful support UBCD provides. Very impressive!
I would like to see an option to boot from a usb device when this support is NOT available from the bios. This is often the case when using an older machine. Or even a new machine where the system designers were not paying attention to the real world.
As cheap as USB-HDD are it make a lot of sense to install linux to an external drive leaving your installed Windows system alone. Dual boot systems can frighten some people away.
I include the following link http://www.neowin.net/forum/index.php?showtopic=269145
from someone who claims success with a particular methodology. I do not have the expertise to duplicate the effort.