Hmmm. I'm sticking with Dingo, and I can listen to Internet radio just fine. And that's streaming, mind you, not a downloaded podcast. I do think that some streaming stations have issues with their service, and the problem has nothing to do with the listener's system. Some of my favorite online stations do not play correctly...they either don't play at all, or stutter or play for 10 minutes or so, then fail. This is as true for my Windoze laptop, as it is for my Pocket eDGe.
In addition to (or instead of) Dolphin browser, I suggest installing some radio or podcast apps. I use
Slideme.org's app, and search "radio"...you'll find
tons of
free streaming apps to choose from. Most work in Dingo, so don't worry about upgrading to Ermine beta, which can do serious damage to your device anyway.