Like phoenix316 said above, that list kinda includes 32-bit PSOne games as well. Plus they'd be more polished, of course. Just like the GBA (in most cases) improved upon the general style used for SNES games. The Minish Cap's a good example of this. If that game'd been released for the SNES 10 years ago it'd have blown peoples' minds (slight exaggeration maybe, but y'know what I mean). I can imagine the same thing will happen for DS-developed games (just look at Mario 64 DS. Mario is far more detailed than he was in his blocky N64 appearance).
Oh and of course, the screen will be clearer. I've always had problems with my N64 putting out a fuzzy picture, which is partly why I don't play it anymore.
I know FFVII:CC will be a PSP-exclusive, but basically there's no real reason why it can't be launched on the PS2. That's sort of what I mean - there's no real difference between the two apart from the fact that one can be played on the move.