Free tool(s) to rip archived NPR audio streams (record Windows Media or Real Audio)?

NPR has almost all of their past programs available to stream, and I'd like to capture some to listen to on my iPod. Using Project URL Snooper, I can find the "hidden" URL for the WMA file. Then what? I've tried putting it into GetASFstream, and I get a "password required" error ... of course, I may not be using GetASFstream properly; I'm just fumbling around blindly with it. Can anyone confirm if this is/isn't possible and explain how to do it? Or suggest a different free software solution? (I hope to rip/save the stream [at full DSL speed], rather than just playing the stream and capturing the audio in real time.) Thanks!