I gave you the only wiki links I read, here's the last one, sorry for the delay.
It's the same link as previous, doh!
This was done under VirtualBox (4.1.18r78361) after I installed archlinux-2012.11.01-dual.iso
systemctl enable dhcpcd@enp0s3
systemctl start dhcpcd@enp0s3
I don't remember what steps exactly 'fixed' the issue (numerous (Right) Ctrl+R in Vbox reboots) but one of those finally 'took'
It won't either until you get an IP.
Don't give up. I'm vested now.