Not sure if this has been posted, but my Unibody trackpad is very loud when clicked and a little bit stiff too - something I noticed right away from upgrading from the "classic" MacBook Pro. I did a little bit research to see if there was a way to try an loosen the trackpad button that would also result in a much quieter click. Well, I found this article and followed the instructions: For those wondering what screw this is, I took a photo of mine. It is the screw in the middle of the "V" on the bottom of the trackpad shell. It is very sensitive and turning even just a fraction will have an impact on the stiffness of the click. Took me about 10 minutes of fine tuning (using a flat headed screw driver) and turning the screw even just a slight millimetre to get it perfect. Now, my trackpad is quiet, I can actually click without getting frustrated and it does my thumb justice too!