One thing the following article does not mention is you need the Web Browser channel in order to use it.

With an account set up you can go to http://www.mp3tunes.com/wiitunes

EDIT:  I should have added that this is also applicable to the PS3, but unfortunately I grabbed the title from the news post I read for the thread title.

MP3tunes Announces Custom Technology for Wii, Plus More Music for New Year's

SAN DIEGO, Dec. 27 -- The thousands and thousands of people who were lucky enough to unwrap a new Nintendo Wii this holiday season can now play all their digital music through the gaming device with new technology from MP3tunes -- http://www.mp3tunes.com. Developed by Rodney Powers for MP3tunes, owners of the Wii can now use the device's controller to wirelessly stream their personal music collections from their own Music Lockers. Music stored in MP3tunes Music Lockers can also be played on the Sony PlayStation 3, Windows Mobile devices, a variety of Internet radios and more, thanks to the MP3tunes open API (Application Programming Interface).

"The Wii is the latest popular gaming device that, with MP3tunes' technology, actually becomes a home stereo system," commented Michael Robertson, CEO of MP3tunes. "Consumers shouldn't be limited in where or how they enjoy their personal music collections, and we will continue to announce new ways MP3tunes is fulfilling its vision of giving people access to all of their music, anywhere they go."

MP3tunes is offering free playlists to sideload to the Music Locker for immediate access on the Wii and other devices. "To demonstrate how simple it is to add playlists to a Locker, we've created, in partnership with CDBaby, a terrific New Year's Eve music set for our customers," commented Emily Richards, President of MP3tunes. "With just one click, this New Year's playlist is sideloaded to your Music Locker for access on dozens of devices -- with no listening limits." Sideload the playlist to your MP3tunes Locker at http://www.mp3tunes.com/

what's the point? 0.o

I can imagine that if you have a nice sound system for your TV and not your PC it would make for a nice feature.

I find Orb much more useful. You can retrieve all the music and videos from your computer and listen to/view them on your Wii.

 I guess but really this type of feature is somehting to be left for the PS3 and 360 since they do it better.

That's not really applicable for people who don't own a PS3 or 360

hahahahahaha man thats a laugh! when i got it i couldnt stop laughing! hahahahah

 but surely these people own dicated sound systems or PC's

XD at signature!!!