Recently I was reading an article about Norwegian songstress Kristin Asbjørnsen when I noticed that she has a Last.fm channel dedicated to her and other Norwegian musicians. I've been listening to it all morning and am really getting into it. I've been listening to Dadafon, Helene Bøksle and even Silje Nergaard's cover of Dream a Little Dream.
For those who haven't used it yet, Last.fm is something of an online radio station in that it streams music to the listener, but it's more than a radio station because you can get fairly specific with the type of music you'd like the site to play for you. I highly reccomend it, especially if you are looking for a resource for Norwegian music.
Speaking of which, I also found out about Lytte.no (which translates to "listen"), a Norwegian website with links to a whole bunch of Norwegian terrestrial radio stations that also stream online. There's everything from NRK P1-P3 to Sami Radio to NRK Super, a station with programming for children.
And if that's not enough for your musical tastes, don't forget about the blog post we ran a few months back about Norwegian Musicians on Myspace.