Update 29/03/2014 : This tutorial is currently outdated and may not work as intended. I made it before Arch switched to the systemd init system.
Optimized for maximum boot speed and read-only filesystem operation (especially for usb drives and other flash memory cards).
DISCLAIMER : As always, use this tutorial at your own risk!
Hardware used for this howto :
Mini-ITX motherboard with Pentium-M 1.5GHz (centrino)
512M DDR ram
Integrated graphics, sound and ethernet.
8G Compact Flash card with IDE-CF adapter.