Nintendo DS emulator has been updated recently. Changes:
Emu:
- Fixed bug in OBJ Bitmap.
- Fixed bugs in SaveStates routines.
- Fixed bug in BEGIN_VTXS register.
- Fixed bug in VRAMCNT_* registers.
- Fixed bug in Frames Skip routines.
- Add Support for 2D render PlugIn.
- Add Console Output for debugger.
- Add support for Guitar Hero Grip.

Audio PlugIn:
- Fixed some bugs in resampling routines.
- Fixed bug in SaveStates routines.

http://www.ideasemu.org/