Both my 16GB Black WiFi model and my wife's 16GB White WiFi have the problem, with mine being worse. It's really only noticeable on a black background and if the brightness is turned up high.
This is a good image to test it with, either set it as your background or use a web browser that allows "full screen".
http://www.fwallpapers.net/pics/computers/apple/I-Love-iPad-black.jpg
Here is an empale from 9to5Mac.com of what it looks like:
This is a good image to test it with, either set it as your background or use a web browser that allows "full screen".
http://www.fwallpapers.net/pics/computers/apple/I-Love-iPad-black.jpg
Here is an empale from 9to5Mac.com of what it looks like:

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