Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Yeah, my girlfriend and I both bought MacBooks together. Her's made the clicking sound, mine didn't. That was 2 months ago and her's is fine now.
 
my powerbook trackpad button does that sound, too.
i bought it a year ago and that sound just appeared a few weeks ago. i just hear it when i push the button on the right side...
 
Same...

I have same noisy problem on the left side. Its really irritating. Bought mine from apple in Sep, just before they released the core duo 2 in the UK. So I have the core duo (1) and a noisy mouse. My life couldnt get worse
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.