Same problem on Thinkpad R60, although it was working a few days ago (no, restarts/reloading module doesn't help).
$sudo modprobe ath_pci
[17234327.760000] ath_hal: 0.9.14.9 (AR5210, AR5211, AR5212, RF5111, RF5112, RF2413)
[17234327.764000] wlan: 0.8.6.0 (EXPERIMENTAL)
[17234327.764000] ath_rate_sample: 1.2
[17234327.768000] ath_pci: 0.9.6.0 (EXPERIMENTAL)
[17234327.768000] ACPI: PCI Interrupt 0000:03:00.0[A] -> GSI 17 (level, low) -> IRQ 74
[17234327.768000] PCI: Setting latency timer of device 0000:03:00.0 to 64
[17234327.768000] ath_attach: unable to attach hardware: 'Hardware didn't respond as expected' (HAL status 3)
[17234327.768000] ACPI: PCI interrupt for device 0000:03:00.0 disabled
0000:03:00.0 Ethernet controller: Atheros Communications, Inc. AR5212 802.11abg NIC (rev 01)
I'm aware that there is a switch on the front edge of the laptop used for turning wireless on/off, and have tried loading the driver while in both positions just for the hell of it. I'd really like to have my wireless back.