I've found these links to be helpful for finding various streaming radio sources:

 * [http://beebotron.org/ The Beebotron]
   This site links to live and listen-again URLS usually obscured by the BBC website without fossicking around the embedded objects.

 * [http://www.radiofeeds.co.uk/pda/rp.asp Radiofeeds To Go]
   This was recommended on the Beebotron

 * [http://www.internode.on.net/residential/entertainment/broadband_radio/ Internode Broadband Radio]
   This primarily points to the intranet sources that Internode sets up for their customers but there's also links 
   to the original streaming station websites.