Over the weekend I returned my iPod Touch to Best Buy. I was having the same "negative black" issue that many users have been complaining about since the device hit the street. For those that haven't heard, some of the iPod Touch screens have difficulty playing dark video scenes or photographs. The dark areas take on a grayish quality and the darkest areas will sometimes go light gray. The result is similar to looking at a film negative, hence the name "negative black effect."
Bottom line: it makes watching video difficult.
From the reports iPod Touches that were built in week 36 or 37 suffer from the problem. While the latest builds are still having screen issues, the numbers are diminishing. To find out what week your iPod Touch was manufactured, look at the serial number. It should start with, "9C7." The two numbers that follow "9C7" are the week it was built.
All of this is why I returned my iPod Touch. Now I wait, wait for the word that the screen issues are resolved.
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