MP3Tunes for the Wii
http://mp3tunes.com/
With MP3Tunes you can now access your MP3’s on the Wii. You do have to use the music locker service provided by MP3Tunes though. There was a client created for the Wii using MP3Tunes open API. If your interested in other ways to get content to your Wii check out this previous post.
(via Digital Trends)
