http://openrock.net has completed a project to produce an installable debian CD image fitting on a Credit Card.
Check it out. The 50MB iso can be used to install a Debian System with most of the usual features anywhere. Just keep it in your purse. Can even be used to install servers since it includes apache, perl, postgres etc and lots of useful diagnostic stuff. Get your emergency Debian/CD for your purse at http://openrock.net. How could you ever have lived without it? This is a true(tm) debian CD with .debs on it not only a basesystem.