PadSend lets you use Gamecube pads connected to a Wii, or a DS, as a PC gamepad. PPJoy must be installed. Just run the server on your computer (requires .NET framework 2.0) and run the client on your Wii or DS. It will only work right now if your DS or Wii has an IP address that starts with 192.168.1.*

http://gbatemp.net/t295119-padsend-for-ds-wii-pc-application