CrunchBang is derived from Debian with an openbox desktop. Minimalistic in design but highly functional.
I downloaded crunchbang-10-20120207-i386.iso (662 MB) from CrunchBang Download. Like all Linux distros these day, it offers 32-bit and 64-bit versions. My desktop suited 32-bit. Download file size is bigger than other light-weight linux distros I reviewed earlier.
I booted the OS from a