Our data host, Libsyn, is owned by a company called Wizzard Media. The folks at Wizzard have put together what looks like a really nice little iPhone podcast web app.
It will allow you to stream *your* podcasts over the Edge data network or over WiFi. You can even import your subscriptions from iTunes.
And hey! Cameo appearance in the how-to video by the Sound of Young America feed!
You can use the app here: http://iphone.wizzard.tv