This is the easy-way (you can find a lot of copylefts here) !
Step Zero: Downdload the archlinux version of raspberry pi
Decompress the image
$ unzip archlinux-hf-2013-06-06.zip
and here you are !
Step One: Find a propel kernel to boot the disk image
V13 built his own kernel - i am lazy !
From xecdesign i’ve downloaded their kernel:
wget -c http://xecdesign.com/downloads/linux-qemu/kernel-qemu
Step Two: You are ready to boot your archlinuxarm disk image:
-no-reboot -serial stdio
-append "root=/dev/sda2 panic=0"
Step Three: Play
Do you want to know a little more ?