For a great all-in-one emulator, try
MorphGear -- previously known as PocketGB. All you have to do is install it, fire up the program -- and load the ROM files! For Gameboy roms, you can even load 'em in zip format, so it saves a lot of room! Where did you hear about the Playstation emulator? Anyway... I don't think I'd be loading one of 'em CD-ISO's onto my puny little SD card
