Hmmm…..you have to pay for it, but it seems a good idea to be able to install Ubuntu to an USB-hard drive.
Read it here at DesktopLinux.com
Is UbuntuUSB sanctioned by the Ubuntu team?
“We are in a co-marketing position, to promote the operating system with the licensing staff of Ubuntu,” Darbonne told DesktopLinux.com in an email. “We do have the right to bundle Ubuntu with our closed source software and/or hardware as long as we give a way to get the source code of Ubuntu. We didn't modify the source of Ubuntu to create UbuntUSB. We just added a loading software to make all this possible.”
I don't know what a “co-marketing position” is….