Anyone who has a Wii should check out
http://www.orb.com/. Its a way of streaming content to your tv via your Wii or any other internet enabled device. Basically you install their program, which servers as a streaming server via their service. You then power up your Wii and start the Opera browser you already downloaded and go to
http://mycast.orb.com and login. You can then watch/listen/see any content you have assigned on the PC running the Orb software. Windows only at the moment I'm afraid and I'm a bit dubious about what they could actually do in terms of seeing what you are streaming, they are US based after all.
Give it a go. The quality of streams of course depends on your internet bandwidth.