I've had a 320x480 PDA since 2001. It's goddamned time for VGA screens Sony!
OK, but aside from the resolution, which I find to be less important than stuff like contrast, brightness, color quality or power consumption, this screen seems to be just great, and even the resolution seems like a perfect fit for the PSP.
Now, I know this is the biggest OLED screen made so far, and the PSP would need an even bgger one, I think. I also don't know how the prices compare with the older screens, but all those high-end Clies are always expensive, and this one is not really more expensive than some other models that they used to introduce. From that alone it seems that the screen price is not siginificantly different, but I could be wrong.