Latest Mountain Lion kext modified to support Atheros AR5B95-H (Atheros 9285 it seems to be known as, as well) (That's the exact card I use, could support others).
Works perfectly. Airdrop supported natively.
Pci id added was vendor 168c - device 303f. You can do this yourself by editing the Airportatheros40.kext in the plugins directory of your io80211family.kext. Add that in the info.plist and you're golden if this works for you (for future reference).
Anyways, enjoy guys!