You can get Atheros AR5007 running by editing the com.apple.Boot.plist file (or whatever it is) and adding "arch=x86_32" to the kernel flags.

I've got Snow Leopard and everything running now on my HP Pavillion Elite m9180f (using this kernel flag and running 32 bit mode), and the only thing not working without it (in 64-bit mode) is my Wifi.

As soon as I can get my hands on a 64-bit kext for the Atheros AR5007 I'll be in business....