Finnix is a self-contained, bootable Linux CD distribution ("LiveCD") 
for system administrators, based on Debian. You can mount and 
manipulate hard drives and partitions, monitor networks, rebuild boot 
records, install other operating systems, and much more. Finnix 
includes the latest technology for system administrators, with Linux 
kernel 3.0, x86 and PowerPC support, hundreds of sysadmin-geared 
packages, and much more. And above all, Finnix is small; currently the 
entire distribution is over 300MiB, but is dynamically compressed into 
a small bootable image. Finnix is not intended for the average desktop 
user, and does not include any desktops, productivity tools, or sound 
support, in order to keep distribution size low.

For more information, please see http://www.finnix.org/ .