Here's a small update about the upcoming s9xTYL 0.4. As you already know, sound emulation will be put media engine and it's closed to be ready. But there will be another new feature.... If interested, check this video. Quality is bad since I made it with a small webcam, but the game is really 60fps ;-)
He also added with this news about his Snes emulator for the PSP:
it's not been decided yet. Perhaps we'll put an option so that the server can send the rom to the client...
right now it's 2 players only, mainly because I have 'only' 2 PSPs... But I plan to add code for 5 players (bomberman rules!). I hope the adhoc network will be fast enough (it should be since it's lan).
later I'll try again internet multiplayer but my first tries weren't very good => internet & wifi = lag and unreliable connection => bad for emulators