Trinux is widely known to be a cool
ram disk-based
floppy distribution of Linux for
security-related purposes. Put a floppy to any PC's floppy drive,
reboot and
*bang*, that machine suddently transforms into a security admin's dream box. (Or at least that's how the theory goes.)
It boots from single floppy and can load packages from either the network or disk.
Home page: http://trinux.sourceforge.net/