This post will be about the Linux LiveCD called SLAX Popcorn Edition.
Some of you may have heard of the Slackware-based SLAX. It is a small but fully functional OS that exists primarily in LiveCD format. I prefer the version of this Os called SLAX Popcorn Edition. This is a minimalistic version, weighing in at only 111MB! It has 6 basic apps. Firefox 1.5, AbiWord, Terminal, Gaim, beep-XMMS, and MPlayer. It uses the XFCE Desktop and Fluxbox, so it should run quite well even on old hardware. All in all, it is a great minimal OS, one of the best that I've seen.
Get it here