Instructions
Access Last.fm's website on your computer. Register and download the plug-in that tracks the plays on your computer.
Play music on your computer and select tracks on Last.fm to add to your playlist.
Open the Internet Channel on your Nintendo Wii home screen and go to Last.fm. Input your username and password to log in.
Select "Radio" at the top of the Last.fm homepage and choose which Last.fm station you want to listen to.