Hmm.... Doesn't work on mine, I have a 533 G4, but I use a ergonomic key board, and I was looking for a way to make a key that would open/close the cd tray...
I find this "feature" to be annoying as all hell...call me a bad typist, I can't go for more than ten minutes without ejecting my cd-tray on my iBook. This should definitely be an option that can be diabled on the keyboard control panel.