Wikipedia
TinyMe
TinyMe is a lightweight Unity Linux-based operating system, using the Openbox window manager. It is aimed at making the computing experience as bloat- and lag-free as possible and is well-suited to older computers, enthusiasts devoted to small/fast systems, or users who just want a minimal environment. TinyMe is comparable to other lightweight Linux distributions like Puppy Linux, Damn Small Linux and Feather Linux.
The distribution produces two Live CD ISO images. The larger, codenamed "Acorn", is a 200 MB ISO image. The other, "Droplet", is a 150 MB ISO image. Both can be installed onto a hard drive or a USB flash drive.