i fall asleep to some shows on abc.com and have the screen turn off after 60 seconds of inactivity. i would hate to have sticky tape residue all over my macbook!
There is a way to do it...you need to figure out what "driver" sends the command for the light to do its thing when sleeping...probably someone who is a computer engineer might know.
Recent switchers ask me this all the time... and it's true, there should be a way to turn it off, but unfortunately there isn't one (as far as I know).