I really tried all of these atheros-workarounds given in this board. nothing really worked for me (kext replacements and so on). but this works for me: i didn't chose the atheros driver during the installation, but the zydas driver (ONLY the zydas driver - deselect everthing else). atheros has bought zydas - it's the same. the system information lists my card as an usb-card, but aiport doesn't recognise the card. don't worry, as the kalway developers (?) developed a very nice tool, which makes you able to connect to your wireless network with your zydas/atheros card even without using airport.
-> Applications/Utilites/WLan (preinstalled app if you've chosen the zydas driver)
maybe i could help you =)
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