Well this has gotten gradually worse over the last year and feel its gonna have to be a call to applecare tomorrow. Its the dark/light streaks coming from both top corners of the screen and right down both left and right edges is looks rubbish, hope you can see from the photo. Its only really noticeable on a light background so I just had plain white to show the problem. Its almost like its grubby behind the screen (between lcd and glass front). Anyone had this before? Really hope apple care can sought it out with the minimum of fuss......