Chiptune forum

http://dsmidiwifi.tobw.net

"The Nintendo DS hardware offers a variety of possibilities for creating music as well as interacting with music. TheRain first had the idea of using the DS as a MIDI controller and created the DSMIDI, a DS cartridge that added a standard MIDI port to the DS that could be used by homebrew DS software.

But since making a DSMIDI requires soldering skills and is rather dangerous, we came up with another idea: Using the DS as a wireless MIDI controller. The MIDI signals are sent to the computer via Wifi, and a server program forwards them to MIDI applications."

w00t!