Wow, do I wish I joined Last.fm sooner. I signed up two days ago, and I love it. What is Last.fm? Its a social networking music site. It is Internet radio that is better than iTunes. It really is a rockin' service.
There are iTunes/iPod plugins for Mac and Windows, the Mac one seems to work just fine.
The site must use less bandwidth than iTunes, because it drops and has to re-buffer far less than iTunes. Sunday had a lot of hiccups, but I have to assume that the site sees a spike in traffic then.
You basically search for music to listen to, ay Pearl Jam. It then streams a radio station (no commercials or irritating DJ) with music like Pearl Jam. I only wish it played Pearl Jam more than often then it does.
But the "Artist Fan Radio" stations seem to play more of the target artist.
Simply wonderful service, I cannot recommend it enough. One final note - it's free.