Yes, I have Airfoil on board! It just isn't quite as unobtrusive as Airplay, when Airplay is actually working properly, and keeps wanting to reboot the whole computer for peripheral updates. It's definitely my fallback, though. I'm already using Airparrot for mirroring, because this is an early 09 iMac.

I'm definitely looking into receivers that can support mirroring, as well as streaming from apps.