Most of the Atheros excitement had been happening in the 802.11g realm, but the 802.11n Linux support for WiFi has received a big boost. Atheros had announced the release of the ath9k driver. The ath9k driver currently lacks access point support, but it's coming and as a whole this driver seems to be fairly complete. The 802.11n Atheros products supported by this new WiFi driver are the AR5418+AR5133, AR5416+AR5133, AR5416+AR2133, AR9160, AR9280, and AR9281 ASICs. This driver is open-source and Atheros is targeting it for integration into the Linux kernel.
The ath9k release announcement can be read at the MadWifi website while the driver source-code and other pertinent information can be obtained from Wireless.Kernel.org.