PortableApps.com needs your help: Please consider making a donation today.300+ free and legal portable apps (over 9GB), up-to-date, & new apps regularly (Apr 19: TAudioConverter).Get the encrypted PortableApps.com Carbide, the fast PortableApps.com Companion, or carry your KeyZ.PortableApps.com lead developer recovering from injury/surgery (Latest News Mar 19th)
I think if Ubuntu Live only need 700 mb's then it should be able to be run from a USB.
Marty, Welcome to PortableApps.com
for previous discussions on the subject.
Using other search criteria in the search box above (e.g. just "ubuntu" or "ubuntu flash" or "ubuntu portable" etc,) will yield even more results.
Things have got to get better, they can't get worse, or can they?