Building a Live CD
Motivation - Why?
To have a bootable version of Arch Linux running totally off a CD, is useful in many ways. It can be made to rescue your HD system, test new machines / hardware if Linux compatible, keep an updated installer with latest packages, or make a demo CD to show your projects, and much more.
Instructions - How
Currently there are two well developed and documented tools available for creating your own Arch Linux-based live media: Archiso and larch. Please refer the respective articles for detailed information as this article will only give you a rough overview.
Archiso is the official tool used to build Arch Linux release images. It strongly follows the KISS principle and is easy to use. If you want to build your own updated Arch Linux live installation images, this tool will get you to your goal quickly as the git repo contains the exact profile used to generate these installation images. However, it can also be used for completely customizing your live medium. It relies on an Arch Linux host system.
larch aims to provide a more desktop-based approach.