You could try Moodio: WebTv Dédiée à la Promotion des Artistes
(I think that's the name) - some have said they like it.
If you decide you want to cough up some coins for a robust solution, Berry Tunes is the best I've seen. $19 from Handango w/a coupon...coupons found at: Handango Coupon Codes - all coupons, discounts and promo codes for handango.com
Berry Tunes does internet radio and podcasts (comes w/a bunch of stations/podcasts pre-set, and you can add your own). It just works...my favorite program on my BB.
See the thread "Internet Radio" in this forum for more info on other free options - I think a few are mentioned there. But I haven't found anything that works as well as Berry Tunes. There is free trial period.
OTA: BerryTunes 2.5
The Internet Radio thread I mentioned describes how to get the MP3 streaming URLs for stations if you need help there...