While there are plenty of folks excited about podcasting, syndicating audio/video to portable media players e.g. the iPod, so far only Jeff Jarvis has succeeded in making the podcasting concept compelling to me. Partially it's his call to citizen's media, call it The People's Radio. It's also the acknowledgement that this stuff really isn't of the web. Sure podcasts are transmitted using Web technology. But their primary purpose, at least right now, is for offline content.
Hidden in Jarvis' post though is the reduction of these temporal media to URLs, the reuse of syndication technologies, and the potential for metadata. Basically you can pull all of the same stunts that are being done for URLs and text content. It'll take a while, but there'll be Feedsters, Waypaths, and Technoratis to take advantage of this ecology. Somewhere out there, a new Blogger and new SixApart are being cooked up (Webjay?) to make creating podcasts way easier. In the same way that Flickr seems to have wandered into a sweet spot for photos and the Web, the podcast groupies are fumbling about trying to figure out what works. Heck you could even imagine Topix.net and Findory style services. Eventually the big boys, Google, Yahoo, Amazon, will take notice and jump in.
For awhile it'll be a glitchy mess, concocted out of stuff we already know. Then the tools will start to peer into the media and things will get really interesting. I still think photos are the current frontier, but podcasting could be the next one.
Then again, I've been wrong before.