Question about sleep light

I'm assuming you mean the sleep light on an iBook or Powerbook right. I do remember a few months back reading about at a hack that someone created that blinked the apple on the top of the case ( if i find it will post the link) but I have not read much about messing with the Sleep LED. May I ask what you want to hack about the sleep LED, i mean its just a small white dot.

Blinked the apple?
Err that'd kinda drain one hell of a lot of power and be very, very bad for the screen.