The xorg18 repository has been cleared out, all packages have been moved to testing. A lot of users have been testing this xorg18 repository with success, so it's time to move it to testing. This means all testing users who haven't tried the xorg18 repository yet will have to reconfigure their input devices on the next upgrade.
The original announcement for the xorg18 repository can be found here: http://mailman.archlinux.org/pipermail/arch-dev-public/2010-April/016387.html