Arch Linux 0.7.2 (i686)

Arch Linux is an independent i686-optimised community distribution for intermediate and advanced Linux users. Originally based on ideas from CRUX, a great distribution developed by Per Lidén.
Arch is fast, lightweight, flexible and simple. Those aren't very fancy buzzwords but they're all true. Arch is optimized for the i686 processor, so you get more for your cpu cycle. It's lightweight compared to RedHat et al, and its simple design makes it easy to extend and mold into whatever kind of system you're building.