The only emulator I had known for a blackberry was called meboy I think. It was a gameboy color emulator. Google it and you should find it. It works on the torch, but not all the roms work well. There is a program you download on your computer and you browse to a rom file and select it. Then the program makes a .jad file so the game is playable on the blackberry. It is buggy and I don't think he is developing it anymore. You could try the crackberry appstore by mobihand too, but the blackberry platform is not as drawing to mobile game designers.
Posted from my CrackBerry at wapforums.crackberry.com
