I did a google and found a script that would be capable of doing this but it doesn't support the distros I've chosen to do it with, namely Ubuntu, Kubuntu, and Xubuntu. Does anyone know how to do this or a script that would be able to make a dvd with the selected distro's?

If you post the script, maybe someone can help mangle it into submission...

Here's a link to the article I found containing the link to the script which after trying to go to it seems to be a farce as far as I can tell.

LiveDVD Script Article

I blundered across this by googling for "multiboot DVD". Maybe it'll help. Sorry, I've never tried this, but it seems like it should be very doable.

Don't know if this is what you after.

I use one rewriteable DVD, occupying only 2Gb, to boot 7 iso.

I think you are going to have a problem with put Ubuntu families into one DVD because they have directories of the same names.

The idea is quite straight forward. Just copy all the iso, after they have been expanded, into the master directory in a hard disk, substitue the isolinux with Grub, use Linux command mkisofs to turn the master directory into an iso, burn it into a DVD and that was it. I still use that DVD and may expand it further if I have time.

I extended the idea to do the same on a pen drive but only partially successful. The about link describes it too.