Here's an excerpt:
In math, when you have to prove a hard theorum, first you try to prove elements of the theory, that if true, would prove the whole thing. In software, you may not know what the final user interface looks like, but you know some layers to it, so in either case you can start work right away. In 1994 we didn't know what the new journalism would look like, and we still don't, but we knew some essential elements, perhaps the essential element -- that sources go direct. It's the thing the Internet does to all intermediaries, it disses them. It happened to travel agents, realtors, classified ads, all kinds of shopping, and it has happened to news too.