i think the psp is the new gp32.i mean,they psp got probably half the emus in the last week that took the gp32 scene ages to get.
i think above all,what psp has more than the other portables is the screen.i love playing my snes games in fullscreen,they look great.the others all have smaller screens.
gp32 is a very tight but somewhat smaller scene,while psp is soon to be worldwide.more and more people will have one and play around with it.it's just an overall great product.
to be honest,all i ever wanted from a gp32 was decent snes emulation,wich it never got.i honestly don't think the giz will be that popular that many people will develope for it.
and i think ds will be good for new homebrew ideas,but not decent emus.
so yeah,psp for me is king already,since it made my gp32 obsolete in just a couple of weeks.the rest are behind.