Wikipedia
ArchBang
ArchBang Linux is a simple lightweight rolling release Linux distribution based on a minimal Arch Linux operating system with the Openbox window manager. ArchBang is especially suitable for high performance on old or low-end hardware with limited resources. ArchBang's aim is to provide a simple out-of-the-box Arch-based Linux distribution with a pre-configured Openbox desktop suite, adhering to Arch principles.
ArchBang has also been recommended as a fast installation method for people who have experience installing Arch Linux but want to avoid the more demanding default installation of Arch Linux when reinstalling it on another PC.