Multi-boot-option USB keys

Hi - I wondered - is it possible to create an Autorun program that lets you choose what you wish to boot on your USB key?

for example:

i can plug an 8Gb USB Key into a PC and restart and at boot choose:
Vista Premium Install Setup
XP Home Install Setup
BART PE with maintenance programs

I fix computers for a living and would like to create the ultimate USB stick with all windows, common drivers and maintenance applications on so I dont have to carry discs around - everything on one USB stick

I can use USB to install XP/Vista or launch a Bart PE/os to be able to scan for viruses without launching windows from the hard-drive...all that sort of stuff..

I would have thought it would be possible - you just create your own Autorun with options that point to setup.exe of windows installs etc etc

can anyone help with this?

thanks