Many iTunes users who have taken the leap of faith and have upgraded to iTunes 9, may have noticed that many of their favorite radio stations are now not listed...missing...unaccounted for. Certain well-loved genres have been nixxed, such as the "Ambiant" category.
I'm not sure of the reason behind this decision by Apple, but if you have not upgraded there are a few things to try before you upgrade, in order to save those links. Again, these must be done BEFORE you upgrade.
First, save your favorite radio stations in a new playlist. Playlists are retained in upgrades so you should be able to see your favoriite stations in the playlist after the upgrade.
Just in case that won't work, it is always a good idea to find out if the internet radio station has a website. If it does, you can go on the website and probably access a link on the site which should open in iTunes. If it does open in iTunes, save it in a playlist for future access. If not, you can at least enjoy the programming via another application.
At the very least, select the station in the old version of iTunes and 'Get Info.' You should see the web address for the stream. Copy and save for future reference and access. In iTunes 9 go to the 'Advance' menu tab and then 'Open Audio Stream.' Enter the web address and you should be on your way.