DS2Key sends PC Keyboard signals through WiFi so you can use your DS somewhat like a PC Gamepad.

Features:

– Action Buttons (Normal button input, a, b, left, right, etc)
– Exact Mouse movement (Touching the middle of the touch screen sets the cursor on the middle of the PC screen, etc)
– Mouse Touch Screen buttons (The screen is divided into having 12 buttons working similar to the normal buttons)
– (New) Guitar Hero Grip buttons (All four buttons act the same as the normal buttons, but have their own settings)
– (New) Mouse Clicks (Left, right, and middle buttons)
– (New) Linux Support (All functions work as they do in Windows now)
– (New) Windows GUI Support (Very friendly GUI :3 )

http://forum.gbadev.org/viewtopic.php?t=16352