fruitoftheloom: that link is down, what is the page about?
Digital: I honestly do not think there is any quick and easy way to install a desktop enviroment in Arch, they all require installing many packages, along with setting up configuration files. If you have selected xfce, then see the archlinux wiki page about it:
http://wiki.archlinux.org/index.php/Xfce
Unfortunately, the above page does not go into great detail about the installation itself. There are a few webpages out there that outline the steps for installation in more detail, what have you done that did not work? Did you get any error messages?
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