if your unibody macbook pro (all sizes) is making the noise in this video when you touch the trackpad or near the trackpad http://www.youtube.com/watch?v=mJmpervXe9M

here is a fix http://tenonedesign.com/blog/fix-you...-like-a-champ/

mine was doing it and it was driving me crazy (like fingernails down a black board crazy), so i cracked her open - however i didn't remove the piece (yet).. i tightened the screws a little and put some tape on the inside of the bottom plate where that piece makes contact. so far no noise..

we'll wait and see if that's done the trick when it gets hot.