Well, eh, this is basically a repost of the fabchannel post, with one BIG difference: this one works, while fabchannel adapted it's interface into an ungrabbable flash frontend.
Let's start over again: download
URL snooper, a freeware program designed to find out the source URL of the streams you are playing.
Run and click "sniff network".
Now, in your favorite browser (yes, this even works in firefox, don't know about opera though), open
kanalenkiezer (Channels chooser in dutch), click the station you want to add, and find the mms:// or the rtsp:// protocol line in the snooper. Copy and add to your pczapper media manager (or with my
handy container tool to a container of your own making).
Voila, there's new content to be viewed on your zapper.
Boy oh boy, where do I find the time to watch all this?