Podcast economic models

Doc Searls has a nice posting on the potential economic models for podcasting, challenging us to think beyond the models that worked for traditional media.  My question would be whether technology alone can support this economic model or whether there would be a need for a new form of intermediary to harness this technology and act as an agent on behalf of the customer. Years ago, I described an infomediary business model in Net Worth that becomes much more feasible with the technology that Doc describes.