after CONSTANT use on my trackpad for the last 3 years i can safely say that it is still and always will be levelprobably because i hit it in the middle...
I think the OP is talking about the Unibody MB, although I'm sure that he would get more response in the MacBook section.
My MBP's trackpad takes the same amount of clicking across the width, so there is definitely a small fault somewhere.
The reason I'm asking in the Macbook Pro section is because I am planning on buying a Macbook Pro and want to make sure that I don't get this same fault on the Macbook Pro
The bottom corners of my 15" (unibody) MacBook Pro's trackpad can depress further even after being clicked, while the center of the bottom can't. The pressure needed to click appears to be constant among the whole bottom side of the trackpad.