A couple of weeks ago, the powers that be in Arch central took the decision to completely strip back the Arch Linux installer from a curses-based interface into a series of scripts that are run from the command line.
That decision was not welcomed universally.
Since you are still able to use both the new installer and the old one — search for archlinux-2012.08.04-dual.iso to find it — we've covered both methods in this gallery: starting with the new, and moving on to the old.
This bootloader is the only common screen between both installation methods.
Read the full review of Arch Linux in Girt By Code.