a couple i'd like to see.....

Monster Hunter Freedom 3 (bring all the new stuff from the PC game Monster Hunter Frontier to the PSP)

Megaman Powered Up 2 (remake of Megaman 2, one of the best NES games EVER, on the PSP)

Soul Calibur PSP.....Need i say more???

Xenosaga PSP.....KOS-MOS + PSP = WIN

Destroy All Humans PSP (mentioned now that this is vaporware.....)

Final Fantasy VI PSP (bring one of the greatest RPGs of all time to the PSP with FULL 3D GRAPHICS!!!............but considering that they've already remade FF III and IV for DS in 3D, it'll probably end up there instead.....)

Final Fantasy VII PSP (if they ever remake FFVII, it should be on the PSP.....though it would probably be on PS3......)

I'll probably think of some more later......