Arch Linux is a general purpose linux distribution that can be molded to do just about anything. It is fast, lightweight, flexible, and most of the parts under the hood are quite simple to understand and tweak, which can make it a good distro to "learn the ropes" on. We do not provide any configuration helper utilities (ie, you won't find linuxconf in here) so you will quickly become very proficient at configuring your system from the shell commandline.
Arch Linux uses i686-optimized packages which gives us improved performance over some of our i386-optimized cousins. This means that Arch Linux will only run on a Pentium II processor or higher. We try to stay fairly bleeding edge, and typically have the latest stable versions of software.
Arch Linux is an i686-optimized linux distribution targeted at competent linux users (read: not afraid of the commandline)