Yes, you can control music on your PC with your Wiimote if you get really really bored…
This app allows users to use their Wiimote to control iTunes, Winamp, Windows Media Player, and Napster.
It offers many functions, such as Play/Pause, Next/Prev track, Volume Up/Down. Any function can be mapped to any button. Plus the motion sensing is used. Shake the Wiimote to the right to go to Next Track.
Take a look and download the application here