When using this script on Snow Leopard, if I had wireless disabled, shutdown, unplugged the network cable, and then booted back up, the script didn't auto enable the airport like it will on Leopard. I found that the plist was loaded as the user and not root. I moved the plist from /System/Library/LaunchAgents to /System/Library/LaunchDaemons. Upon reboot, the plist was loaded as root and resolved the issue not enabling the airport.

Also, to ensure to force the script to check the state at logout/reboot, I created a script and set a LogoutHook to clear the prev_air_on and prev_eth_on files at log out:

#!/bin/bash
cd /
airfile=/var/tmp/prev_air_on
ethfile=/var/tmp/prev_eth_on

if [[ -f $airfile ]]; then
	rm -f $airfile
fi
if [[ -f $ethfile ]]; then
	rm -f $ethfile
fi

touch /Library/Preferences/SystemConfiguration/toggleairport.txt
rm -f /Library/Preferences/SystemConfiguration/toggleairport.txt

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