I must say I have personally had almost nothing but trouble with my ath9k. With ubuntu 10.10, nearly 2 years after I bought the card, I can finally use this device.
Yeah, this open sourcing everything seems to make everything great instantly.
Oh. I nearly forgot to mention that this n-hardware card still transmits no faster than 1-2 MB/s despite Windows driver has worked at full 15 MB/s speed from day one.