Snezzi DS
A new SNES emulator for the Nintendo DS
The SNES emulator for GBA "Snezziboy" by bubble2k2 has been ported over to the DS by a dude called Garry Linscott. Currently it does not have sound support, but the screen has been scaled up to the (slightly) larger DS resolution, and it has the obvious advantage that you can now use the X and Y buttons.
Downloads (including source) and instructions are available at the official site here: