MultiBoot is an application similar to the MultiCD script which we wrote a while back, except MultiBoot comes with a GUI so is somewhat easier to use for non-technical users.
What MultiBoot does is allows you to make a live USB with multiple Linux distributions. A list of supported Linux distributions can be found HERE.
To install MultiBoot in Ubuntu, simply paste this in a terminal:
wget http://liveusb.info/MultiBoot-v3/install-depot-multiboot.sh.tar.bz2
tar -xvf install-depot-multiboot.sh.tar.bz2
sudo ./install-depot-multiboot.sh
Of crouse, you may want to check out the script before running it. The last command will run the installer.
Once installed, you can access it via the Applications > Accessories > Multi System menu item.
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http://www.webupd8.org/2010/03/how-to-create-multiboot-liveusb-using.html