Arch Ndiswrapper

Install ndiswrapper and it's utilities:

pacman -Sy ndiswrapper ndiswrapper-utils

Once the installation has completed, follow the steps to configure ndiswrapper.

ndiswrapper -i filename.inf
ndiswrapper -l
ndiswrapper -m
depmod -a

filename.inf is your windows driver file.

Now load the module and configure your connection:

modprobe ndiswrapper

Add ndiswrapper to the rc.conf MODULES=() line

MODULES=(ndiswrapper snd-intel8x0)

For more up to date information, and information on connecting to a wireless network under Arch: http://wiki.archlinux.org/index.php/Wireless_Setup