Fedora 7 includes a new module named asus-laptop which replaces the old module asus_acpi.
The led control file for the mail led is now
/sys/class/leds/asus:mail/brightness
( 0 -> off, nonzero -> on)
In that way you can "link" it to what is called a "trigger", e.g. something which is generating events to switch on and off the led.
for example:
modprobe ledtrig-heartbeat
echo heartbeat > /sys/class/leds/asus:mail/trigger
mac80211 wireless devices have triggers for tx and rx too

(to see what are available, just cat /sys/class/leds/asus:mail/trigger )
in
/sys/devices/platform/asus-laptop
you can still switch on/off wireless and bluetooth
Note that "wlan" just control the led, though "bluetooth" actually detach the power from the internal usb controller.
Hope this helps