Scripting News points out “Why Darren Barefoot isn’t smoking the podcasting dope.”
I’m holding off on getting into audiocasting myself. Unlike text, you don’t have the ability to compress, skim, index and cross-reference (although metadata will help those last items) and you have to devote 1:1 time to consume it. I can power-skim 500 articles in the news aggregator in a few minutes, dipping in and out of articles of interest, skipping to the bottom of the list or searching for a keyword or phrase with Apple/Control-F.