Mine is not Apple's antiglare...15", glossy with an antiglare film (you can't tell though, of course). Picture is attached - taken with an HTC HD2. My angling is off though - the screen is slanted and it's hard to get a dead-on shot at this hour. Probably take a better one at work tomorrow.
I see the issue in the pictures posted...to me and what I know of LCD/LED tech, it appears to be a power issue, not an issue with the screen itself. I'd be curious to know if the same thing happens when on AC adapter and with the backlight cranked. I'd also be curious to know if it changes when doing calibration.