loopy_ has updates his SNES emulator for the Nintendo DS. Changes in this new version are :

fixed DMA, new modes and wrapping within bank supported

Sprite register writes are done correctly with latching now

Better CPU/APU sync (hopefully for the last time – yew you note crashes in level transitions in eg. mario, let me know)

Speed up one the APU side, should Be less sound crackling

http://nintendo-ds.dcemu.co.uk/snesds.shtml