Apparently the 3000 model has bad horizontal interlacing lines when you play games and/or watch movies. There is a huge thread on the official Sony PSP boards, there's an article on Kotaku, comparison vids/images on Youtube and the web. Sony has even cancelled their 4G PSP package.
I have a 2000 psp and haven't seen the 3000 screen in person, but been reading up on it and a lot of 3000 buyers aren't happy.
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