first off, if you look at it directly at the touch screen you cannot see it.
you have to look at it from behind a little.
also the yellow area seems to change places from time to time...
i have a Hori screen protector, but i dont want to waste it if my DS is slightly defected, as i still have 10 days on the reciept to return it...
I've read on IGN and a couple other sites that its fairly common amd not to worry, but its not too
common, id llike to exchange it and a clean one.