PSP 3000 owners may notice that there is no longer ghosting on screen, but now it has a whole new issue. The new PSP suffers from scan lines during video playback and gaming. Sony has this to say:
On some occasions, scan lines may appear on scenes where brightness changes drastically, due to the hardware features of the new LCD device on PSP-3000. Installed with this new LCD device, PSP-3000 offers more natural and vibrant colors on its screen, but the scan lines have come out to be more visible as a result of improving response time to alleviate the afterimages on PSP-3000. Since this is due to hardware specification, there are no plans for a system software update concerning this issue.
So before you go out and upgrade to the PSP 3000 or even buy your first PSP (3000) make sure this is something you can live with seeing there is no plan for a software fix for this problem. I think I would rather have the ghosting than the scan lines, but the new PSP does have a brighter screen so sometimes we have to take the good with the bad.