For talk radio (or any radio, for that matter), if the station provides an internet mp3 stream, I'd recommend BerryTunes.
There's a week free trial, about $19 at
Mobile Software and Games for your PDA or Smartphone : Handango w/coupon
You can download the trial at:
BerryTunes 2.5
Also does podcasts, and will play MP3s as well if you like (but the Pearl's built in player is better at that, IMHO).
The strength of BerryTunes is in it's ability to stream internet radio and podcasts smoothly and without breaks/skips.
I've tried every streaming tool available for the Pearl that I could find, and Berrytunes is the best at providing a steady stream w/out skips and connection issues. They have just releases a new version - 2.5.7.