I'm hoping Apple's learned how to get decent screens. My first iPod Touch was awful, as was the second, by the third I just gave up and accepted that I wasn't going to be getting a decent screen in the near future and as time went on I just decided not to return it because I'm too lazy.
In saying that, the iPod Touch was 'only' £269. The iPhone is a lot more money over time, so if there's even a slight negative black on my new iPhone it's going straight back to O2. Hopefully if there is another negative black problem, enough people will return their phones and demand new ones that Apple will come to the conclusion that it's costing them more money and reputation than it would to just get decent screens.