I bought my white macbook is june 09. A few months ago i noticed that i can now push in the case on the left hand side where the two strews are on the left hand side oposite to the trackpad sort of. I can push it in really all the all under the not so white part where you put your hands if you get me xD.. I never payed much attention to it because its not a big deal but im afraid it will get worse or something.