We are talking Homebrew and Emulators here but whats the Port you would like to see or maybe even a new version of an existing release on the PSP, obviously you have to be realistic and remember that PSP developing still has a long way to go, most releases dont use any ASM so for emulators that could mean quite a difference.
Ill start off by saying i would love a port or even a Nintendo 64 emulator released on the PSP, the buttonconfig might be a problem but to see Mario 64 on the PSP would be awesome.