Hmm, so you look at the PSP through that attached screen, projected like that?  If it has to be held above the screen at a certain distance, it might be a little uncomfortable.

So this is meant to give similar results as 3D glasses?
If so, I'm surprised that just a screen, without supporting software, can do it, that is, extract some sort of 3D perspective from a 2D image (what does it do to non-3D images?).