Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Doesn't work for me. I plugged my iPhone headset with the clicker into my MBP. Does nothing when i click.

Only works on the Unibodies I believe.

Apple have certainly been fiddling around with the protocol they use on the new in-line remotes though e.g. volume control doesn't work on the iPhones, but does on iPod nano, Classic and new shuffle. I assume volume control doesn't work on the notebooks?
 
Works with my unibody macbook. I swear I tried this when I got it, didn't work then, but now it does.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.