install arch and then pacman -S gnome
netdaemon  rubygarden 
Search for packages with pacman -Ss <package> and then install with pacman -S <package>. 
read man pacman for more information.
http://wiki.archlinux.org/index.php/Wireless_Bootup_Script
http://wiki.archlinux.org/index.php/Wireless
iwconfig interface_name essid network_name key xxxxxxxxxx
/etc/rc.d/network restart to be precise.
type "iwconfig"
ifconfig
on the device that has wireless extensions it will normally say "IEEE something"
once you got the network connected, you can throw those commands in /etc/rc.local
http://pastebin.archlinux.org
a good practice is to 'pacman -Sy <packagename>'
http://pastebin.archlinux.org/8843