This is a cool little Distro i use :
Minux is a very small Linux system. No harddisk, no CD-ROM, no installation needed.
It needs just one 3.5" floppy disk !
It's usefull:
To run a computer with Linux, where no installation is possible or allowed. (For example your office computer, etc.)
To do some work on Linux, without installing a complete Linux system.
If you want to use some of the very usefull commands and tools from Linux.
You want to run your old computer as a Linux machine and you don't want to do any installation, just to check, if it works.
etc.
http://www.online-center.com/minux/