Bell Sympatico in the great state country of Canadia have put up a slew of concerts that can be viewed streaming, online. Of course, this includes the very excellent Great Big Sea, which is a Newfoundland Canada group playing a rock/celtic music. They had a great concert in Royal Oak, Michigan last year that I got to see them at.
Streaming concerts, especially after the fact, seems like a great marketing ploy. As I consider going to a band's concert, or even checking out their music, a concert is an excellent chance to see them perform, but in this case without the $50 upfront cost. It will never replace going to a real (good) concert, or stop me from buying an album that has been laid out and I can easily take with me on my iPod.
You'll also find The Cure, The Killers, and Black Eyed Peas.