Hi SonicEpsilon,
The Hardy starter guide is
here, but only addresses codecs and Grub at this point in time, and so is not well developed for your topic. I would still bookmark it for future reference.
The Gutsy starter guide is
here, which might be able to help or at least give you some ideas.
The issue is how to install your Atheros AR5BXB63 driver in Ubuntu Hardy (as you know).
The Gutsy guide gives information on installing a Broadcom wireless driver which may give you an idea. However, that approach assumes that the repository has what is required - which for your driver I do not know.
Have you tried visiting the Ubuntu forums at
http://ubuntuforums.org/ to either search for an answer for your driver or ask the question to get help?
I found
this thread at ubuntuforums.org regarding your driver.
-- Tom