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I wouldn't count on Apple or any other manufacturer regarding this problem - it happened to the last 5 laptops I owned and no, I didn't dance on them :D

The last one was a Macbook C2D and cleaning didn't help. Maybe the fact that some people have problems with it and other's don't can be accounted to tolerances in the manufacturing process. Plus it really takes a lot of time before the scratches become noticeable. I put my laptop in a messenger bag every morning and go to university by bike. I'm quite sure it took a few month before I saw them the first time.

I'll definitely buy a cover for my next computer. Maybe something which can be used to clean the screen as well. The scratches are not such a big deal, but they are in a place I look at quite often.
 
I bought Crumpler's The Slip for my MBP because I've seen quite alot of laptops with keyboard marks on the screen. Wether or not the marks I had seen were permanent I don't want to risk getting permanent marks on a 3k laptop. Plus it's nice to have when the screen or keyboard is dusty and need a quick wipe with the slip :)

@ XheartcoreboyX: Ease up a bit and stop trolling ;)
 
It kinds of depends on how you carry your laptop around.
I had an ibook G4 that started getting marks on the screen (though I wiped them off and got a screen protector before anything became permanent).
I carried this ibook around in a backpack with a laptop compartment, and it always had LOTS of books pressing against it.
The MBP I have now is a year old. For most of that, I carried it in it's own Incase shoulder bag. This last Christmas my girlfriend got me a reaaaaally nice Samsonite over-the-shoulder bag. It also has a laptop compartment, and although it made me nervous at first, I've been carrying it around in there ever since and haven't noticed any screen problems. I think the fact that the bag is not bouncing against my back all day and does not put nearly as much direct pressure on the MBP (the laptop compartment is in the middle of the bag and I don't carry 5 textbooks around anymore) is all the precaution that needs to be taken.
 
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