I can confirm that I am having the same problem, which means that the 
toggleAllWirelessStates function does not work as it should.
I am running a Thinkpad Z60m with 2.6.20-16-generic with acpi_support 0.95 in 
Feisty Fawn (7.04).
I also receive the same error as Herbert:

# echo -n 2 > ath0/device/power/state
bash: echo: write error: Invalid argument

#echo -n 1 > ath0/device/power/state
bash: echo: write error: Invalid argument

# cat ath0/device/power/state 
0

There is no "rf_kill" available, and based on the comment in the "state-funcs" 
file:
# Attempts to use 'rf_kill' first, and then tries 'power/state', though that
# will fail on >=2.6.18 kernels since upstream removed the functionality...

-- 
acpi-support/state-funcs:toggleAllWirelessStates() wrong on power/state
https://bugs.launchpad.net/bugs/120955
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