Found an interesting radio stream: Uppercut. Seems to be a nice mix. There is IDM/Breaks, Chiptunes, Breakcore, Raggacore ... (whatever it is). A lot of strange stuff. I'm listening to it right now! Limited to 50 listeners at once. You may take a look at the handwritten schedule.
And check out this site: http://www.internet-radio.org.uk/
Nice list of internet radios plus search functions!