I use it quite well to play some old GC games. Playing the Wii part is quite simple too. The Wii Mote (actually the Wii itself too) uses BlueTooth as it's type of signal and receiver. So if you have a BlueTooth module or something installed on your PC, you can configure a program called Glove Pie to make the module accept the Wii Mote's address.

I used to use on as a mouse on Linux. :P

Setting a Wii Mote up with Dolphin is so much easier though.