I’m a long-time and daily user of Scrivener writing software. It is a superb tool for structuring longer projects and it will feature quite often in future Organic Organising posts. I used to recommend it to my graduate students, and now do so to any of my clients who ask my advice (it can help enormously with the developmental editing workflow).
I think software competition can get a bit 0ver-heated and silly though – choice of tools, or even OS, doesn’t have to be a zero-sum game – which is why I only agree with about half of this recent comparison between Scrivener and Word.
It’s an interesting read though: the re-description of Scrivener as a data-base for your writing is a valuable insight.