Itunesdata
Jenny writes in –

This tutorial will show you how to stream your iTunes music library to your Wii through the Opera browser. The Opera browser can be download to your Wii for free from the “Wii Shop Channel.” This tutorial will work with both a Mac and a PC.

Things you’ll need:
Nintendo Wii with Opera Browser Installed (free from the shop channel)
iTunes
MyTunesRss (free)

hackaddict.net: Tutorial: iTunes on the Wii!!! (for free) – Link.