I think what I'd really like though, is not so much the hard-core tech content (audio is not good for that), but just to get good portraits of technically creative minds, their ideas, and their stories.
Hackers focus on the the "how" and "what" of technology, but rarely the "why". The story of the idea itself, and its relation to the creator's life, is left untold. Non-hackers trying to write about technology struggle to find the human story, because they don't really grok what the technology is or what that person's contribution has really been. There's got to be some way to tell these stories.