I had the pleasure of meeting a representitive from Melodeo at the Portable Media Expo last weekend and was given a demo of the Melodeo podcast browser in action (on his cell phone). I have to admit, I was quite impressed. Through their mobile phone interface you could browse through their directory of podcasts in a variety of ways and when you found a podcast, you could choose to download it or if you like, stream it.
"Melodeo, Inc., the first company to deliver over the air podcast downloads on mobile phones, today released a new version of Mobilcast(TM). Mobilcast lets consumers download podcasts over the air and listen to them on their mobile phones. The new version of Mobilcast improves this experience by introducing on-demand streaming, and Share. "