(http://www.mattfoster.clara.co.uk/madwifi-1.htm What is MADwifi?)

'''M'''ultiband '''A'''theros '''D'''river for '''WiFi''', A linux device driver for 802.11a/b/g universal NIC cards - either Cardbus, PCI or MiniPCI - that use Atheros chipsets (ar5210, ar5211, ar5212).

The driver is based on a binary HAL (and so the driver will taint the kernel), and the sourceforge page currently has four registered developers.
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The (http://sourceforge.net/projects/madwifi sourceforge) site shows '''no''' released files, however the (http://madwifiwiki.thewebhost.de/wiki/FrontPage wiki) has a link to a (http://prdownloads.sourceforge.net/madwifi/ tarball) while PebbleLinux supports the  __MadWiFi CVS version from 04/20/2004__. 
So, there are apparently some working versions out there.