Yesterday we wondered what was up with some of the newer 3DS screens, as they appeared to have a yellowish tint to them. According to Nintendo's FAQ, this isn't something tow orry about.
Due to LCD manufacturing processes it is possible for system screens to look different from one another. The image may appear slightly darker, or have a different tint when compared to another Nintendo 3DS.
This is within manufacturing specifications, and the unit does not need to be repaired.
I guess Nintendo isn't trying to save some cash during development...it's just luck of the draw. Thanks to Zach for the heads up!