From their site.
Finnix, the LiveCD for system administrators
Finnix is a self-contained, bootable Linux CD distribution ("LiveCD") for system administrators, based on Debian testing. 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 2.6, LVM2, encrypted partitions, etc. And above all, Finnix is small; currently the entire distribution is over 300MiB, but is dynamically compressed into a bootable image of about 100MiB. 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.