Here is a idiot proof (almost) instruction for the SNES emulator:
1) Download the 1.5 files at this
link. These are already Swaploit'ed, so they're good to go.
2) Put the EBOOT.PBP file from the MS1 folder into your 32MB MS Pro Duo, into the directory /PSP/GAME/SNES/
3) Put the EBOOT.PBP file from the MS2 folder into your bigger MS Pro Duo, into the directory /PSP/GAME/SNES/
4) Put the raw (*.smc) ROM file(s) you wish to try into the bigger MS Pro Duo, into the directory /PSP/GAME/ROMS/SNES/
5) Put the 32MB Stick into your PSP, take out UMD disc, then turn on the PSP.
6) Go to the game icon on the far right, go down to the last icon, press the X, you should see a really gay splash screen saying the 1.5 exploit. Press the X again, and the PSP will run the program.
7) During the duration of the PSP splash screen, you have to take out the 32MB stick, and insert your larger MS Pro Duo. If you're slow, the emulator will not launch. So be quick.
8) If done properly, emulator will run. You'll see a menu and you can select the ROMs that are in the proper folder /PSP/GAME/ROMS/SNES/. Remember, for this SNES emulator, the darker color is the highlight, you'll see what I mean.
Misc instruction: If you move left on the thumb stick while running the SNES emulator, you'll get a setup menu. There you can adjust the speed of the PSP (222MHz, 266MHz, 333MHz), the speed of the emulator (running speed at 1.0x, 1.1x, 1.2x... etc), also the screen size, and other misc properties. I tried to set it at 1.5x and 266MHz, the emulator seems to run at about 80% of the speed, with sound. Adjust at your own risk.