Q4OS

http://linux.softpedia.com/get/System/Operating-Systems/Linux-Distributions/Q4OS-92858.shtml#download
Q4OS is an open source distribution of Linux that provides users with a minimalistic computing environment comprised of a lightweight desktop environment and a handful of applications and utilities.

Distributed as 64-bit/32-bit ISO images

The system is distributed as two ISO images, one for each of the supported architectures (32-bit and 64-bit), that can be written to blank CD discs using any CD/DVD burning software, or deployed to USB flash drives using the UNetbootin application.