xPUD
XPUD is a minimal Live Linux distribution designed around simplicity and speed, featuring a very basic user interface with only essential applications such as a web browser and a media player. Its lightweight design allows it to run on older hardware and transform almost any PC into a kiosk-like station or a quick-boot system for web and media use.
The last official release, version 0.9.5, was published in November 2010.
Links: Xpud Homepage, Source code @ github