You can try this link through my local public radio's web page:
http://wpr-ice.streamguys.net/wpr-ideas-40.m3u
That will link to whatever is playing on Wisconsin Public Radio right now.
Here is a link to the page where you can pick a data rate, format, etc.
http://www.wpr.org/webcasting/live.cfm
Here's one for NPR:
http://www.sciencefriday.com/about/listen/