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apt-get install linux-headers-$(uname -r) wget -c http://snapshots.madwifi.org/special/madwifi-ng-r2756+ar5007.tar.gz KERNELHEADERS=/usr/src/linux-headers-$(uname -r) make install modprobe ath_pci modprobe wlan_scan_sta -
If you don't like that, read http://forum.eeeuser.com/viewtopic.php?pid=47421#p47421 to see how to build a Debian package.
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For WPA, I configured wpasupplicant manually. See http://wiki.debian.org/DebianEeePC/HowTo/Wifi.