I have a Core 2 Duo Macbook (week 1, '07) which has been flawless except for what appear to be permanent keyboard marks on the screen (won't wipe off). For the first few weeks I used the foam insert that the unit shipped with, but eventually lost it. Also, I was under the impression that the Macbook was designed as to prevent this. Besides, dealing with a screen protecter is an unholy PITA. In any event, there's a really noticeable mark in the middle of the screen (from the space-bar) which measures about a millimeter wide, 4 " long, as well as outlines of most of the keys. My friend's iBook (Nov '05), has no such marks, neither does a friends last-gen Powerbook. I also have a well-used and trashed 550 Mhz Ti Powerbook, which has no such marks. My Pismo however, has plenty of the same marks (but not from the space-bar). Any others out there? I'm not even sure what could be done to fix this, if the tolerances are too close (keyboard too high/screen sitting too low). Perhaps I'll post some photos later if there's enough interest (my camera is at home).