Using the Ambicom drivers from their web site, no, I can not turn the power off for my Ambicom WL1100C-CF card.
However... using the Senao drivers as suggested posted by GLEN8 in
http://www.pocketpcthoughts.com/foru...236&highlight= (about the 8th post down) DOES allow me to turn the card off without removing it.
The card seems to perform about the same using those Senao drivers.