Radio on the Internet for schools (continued)

I've trying Radionomy and the system seem to work quite well, but it means a lot of work. Another drawback is that they insert commercials in your radio, but that seems a low price to pay for the service. With Winamp and Shoutcast you have more control over your own radio, and I think you can also play "live" music or speech, but I'm still having trouble with the IP address. Again, if anyone has experience on that, comments will be welcome.