even if it was true and that is an accident i highly doubt that a 8th of an inch gap that like 6 inches long is going to drop the temp on a laptop a check and see if that is a vent becuase wouldnt extreme heat coming out of it (90 degrees and higher as these people are saying) screw with the lcd?? check and see how much heat is coming out of your macbook there cant be much! i would check but i dont have 1
Given that at least a couple of people have reported this plastic, it's not just a single-case thing (like the report of the black plastic flaking off, which to my knowledge has not been replicated). On the other hand, it's not widespread enough by a long shot to be the primary cause (or even a major contributor) of the heat problems.
Black Macbook Core 2 Duo
Upgraded Sawtooth (900 Mhz)
12" 867 Mhz PowerBook - RIP