ArchBang Linux (homepage) combines the lightweight Arch Linux with the fast and simple Openbox window manager - the desktop is based on LXDE, and the name ArchBang is inspired by #!CrunchBang Linux, which (also?) uses LXDE components selectively.
ArchBang GNU/Linux reduces the entry barrier to using Arch, for those who find the default Arch set-up process intimidating. It aims to provide an out-of-the-box Arch Linux experience with a pre-configured Openbox desktop suite. However it still adheres to "The Arch Way," a set of principles that governs the development, maintenance and distribution process of Arch Linux (Simplicity, Code-correctness, Usercentric, Openness and Freedom).
ArchBang is available in both 32-bit and 64-bit versions.