I'm working on an SNES Emulator for the DS called SNESEM. It will be made entirely with PAlib. So far I have gotten it to successfully open a ROM and read the header so it can tell if it's HiROM or LoROM, it's ROM title, the ROM Region and so on. I am not providing a download yet however there will be a demo available soon. I may make it open-source, but it depends if I can be bothered to add comments in or not. Also, I know that there are already SNES Emu's for the DS out there, but I'm making this just because I like working with the SNES.