I installed Debian GNU/Linux on my laptop (over Arch Linux) last week, and used module-assistant to install the Madwifi driver for my atheros-based wireless card using The Debian Way(TM).
Here is just a quick note of the commands needed to install madwifi using module-assistant under Debain GNU/Linux:
# apt-get install madwifi-source madwifi-tools module-assistant
# m-a update
# m-a prepare
# m-a a-i madwifi
# modprobe ath_pci
…and that’s all there is to it. Not quite as easy as ‘emerge madwifi-driver’ or ‘pacman -S madwifi-ng’ but still fairly straight forward.